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Gilly Macmillan is a British Sunday Times, New York Times and Internationally bestselling author of mystery novels.

She is best known for books such as The Perfect Girl (2016), What She Knew (2015), and Odd Child Out (2017).

Born in the United Kingdom, she studied History of Art at Bristol University before doing an MA in Modern British Art at the Courtauld Institute of Art.  

A former art historian and photographer, Gilly has worked at the Burlington Magazine, the Hayward Gallery and taught photography at a sixth-form college in Swindon.

She has also worked at a café opposite Keplers bookshop in Menlo Park, CA., which was by far her favorite job.

Now a novelist, she currently makes her home in Bristol, England, where she lives with her husband and three children.

More about Gilly Macmillan

Genres: Mystery, Thriller

United Kingdom

Website: https://www.gillymacmillan.com/

Non Series

  • The Perfect Girl (2016)
  • I Know You Know (2018)
  • The Nanny (2019)
  • To Tell You the Truth (2020)
  • The Long Weekend (2022)

DI Jim Clemo

  1. What She Knew (2015)
  2. Odd Child Out (2017)

Detailed book overview

Non Series

The Perfect Girl

Zoe Maisey is a seventeen-year-old musical prodigy with a genius IQ. Three years ago, she was involved in a tragic incident that left three classmates dead. She served her time, and now her mother, Maria, is resolved to keep that devastating fact tucked far away from their new beginning, hiding the past even from her new husband and demanding Zoe do the same.

Tonight Zoe is giving a recital that Maria has been planning for months. It needs to be the performance of her life. But instead, by the end of the evening, Maria is dead.

In the aftermath, everyone—police, family, Zoe’s former solicitor, and Zoe herself—tries to piece together what happened. But as Zoe knows all too well, the truth is rarely straightforward, and the closer we are to someone, the less we may see.

Author: Gilly Macmillan
First Release: 2016
ISBN: 978-0062476760
Publisher: William Morrow Paperbacks
I Know You Know

Twenty years ago, eleven-year-olds Charlie Paige and Scott Ashby were murdered in the city of Bristol, their bodies dumped near a dog racing track. A man was convicted of the brutal crime, but decades later, questions still linger.

For his whole life, filmmaker Cody Swift has been haunted by the deaths of his childhood best friends. The loose ends of the police investigation consume him so much that he decides to return to Bristol in search of answers. 

Hoping to uncover new evidence, and to encourage those who may be keeping long-buried secrets to speak up, Cody starts a podcast to record his findings. But there are many people who don’t want the case—along with old wounds—reopened so many years after the tragedy, especially Charlie’s mother, Jess, who decides to take matters into her own hands.

When a long-dead body is found in the same location the boys were left decades before, the disturbing discovery launches another murder investigation. Now Detective John Fletcher, the investigator on the original case, must reopen his dusty files and decide if the two murders are linked. With his career at risk, the clock is ticking and lives are in jeopardy…

Author: Gilly Macmillan
First Release: 2018
ISBN: 978-0062698605
Publisher: William Morrow Paperbacks
The Nanny

When her beloved nanny, Hannah, left without a trace in the summer of 1988, seven-year-old Jocelyn Holt was devastated. Haunted by the loss, Jo grew up bitter and distant, and eventually left her parents and Lake Hall, their faded aristocratic home, behind.

Thirty years later, Jo returns to the house and is forced to confront her troubled relationship with her mother. But when human remains are accidentally uncovered in a lake on the estate, Jo begins to question everything she thought she knew.

Then an unexpected visitor knocks on the door and Jo’s world is destroyed again. Desperate to piece together the gaping holes in her memory, Jo must uncover who her nanny really was, why she left, and if she can trust her own mother…

Author: Gilly Macmillan
First Release: 2019
ISBN: 978-0062875563
Publisher: William Morrow Paperbacks
To Tell You the Truth

To tell you the truth...everybody lies.

Lucy Harper’s talent for writing bestselling novels has given her fame, fortune and millions of fans. It’s also given her Dan, her needy, jealous husband whose own writing career has gone precisely nowhere.

Now Dan has vanished. But this isn’t the first time that someone has disappeared from Lucy’s life. Three decades ago, her little brother Teddy also went missing and was never found. Lucy, the only witness, helplessly spun fantasy after fantasy about Teddy’s disappearance, to the detectives’ fury and her parents’ despair. That was the start of her ability to tell a story—a talent she has profited from greatly.

But now Lucy’s a grown woman who can’t hide behind fiction any longer. The world is watching, and her whole life is under intense scrutiny. A life full of stories, some more believable than others. Could she have hurt Teddy? Did she kill Dan? Finally, now, Lucy Harper’s going to tell the truth.

Cross her heart.

And hope to die.

Author: Gilly Macmillan
First Release: 2020
ISBN: 978-0062875594
Publisher: William Morrow Paperbacks
The Long Weekend

Three couples. Two bodies. One secret.

Dark Fell Barn is a “perfectly isolated” retreat, or so says its website when Jayne books a reservation for her friends. A quiet place, far removed from the rest of the world, is exactly what they need.

The women arrive for a girls’ night ahead of their husbands. There’s ex-Army Jayne, hardened and serious, but also damaged. Ruth, the driven doctor and new mother who is battling demons of her own. Young Emily, just wed and insecure, the newest addition of this tight-knit band. Missing this year is Edie, who was the glue holding them together, until her husband died suddenly.

But what they hoped would be a relaxing break soon turns to horror. Upon arrival at Dark Fell Barn, the women find a devastating note claiming one of their husbands will be murdered. There are no phones, no cell service to check on their men. Friendships fracture as the situation spins wildly out of control. Betrayal can come in many forms.

This group has kept each other’s secrets for far too long.

Author: Gilly Macmillan
First Release: 2022
ISBN: 978-0063074330
Publisher: William Morrow Paperbacks

DI Jim Clemo

What She Knew

In a heartbeat, everything changes…

Rachel Jenner is walking in a Bristol park with her eight-year-old son, Ben, when he asks if he can run ahead. It’s an ordinary request on an ordinary Sunday afternoon, and Rachel has no reason to worry—until Ben vanishes.  

Police are called, search parties go out, and Rachel, already insecure after her recent divorce, feels herself coming undone. As hours and then days pass without a sign of Ben, everyone who knew him is called into question, from Rachel’s newly married ex-husband to her mother-of-the-year sister. Inevitably, media attention focuses on Rachel too, and the public’s attitude toward her begins to shift from sympathy to suspicion.

As she desperately pieces together the threadbare clues, Rachel realizes that nothing is quite as she imagined it to be, not even her own judgment. And the greatest dangers may lie not in the anonymous strangers of every parent’s nightmares, but behind the familiar smiles of those she trusts the most.

Where is Ben? The clock is ticking...

NB: This book is also known as Burnt Paper Sky.

Author: Gilly Macmillan
First Release: 2015
ISBN: 978-0062413864
Publisher: William Morrow Paperbacks
Odd Child Out

How well do you know the people you love…?

Best friends Noah Sadler and Abdi Mahad have always been inseparable. But when Noah is found floating unconscious in Bristol's Feeder Canal, Abdi can't--or won't--tell anyone what happened.

Just back from a mandatory leave following his last case, Detective Jim Clemo is now assigned to look into this unfortunate accident. But tragedy strikes and what looked like the simple case of a prank gone wrong soon ignites into a public battle. Noah is British. Abdi is a Somali refugee.  And social tensions have been rising rapidly in Bristol. 

Against this background of fear and fury two families fight for their sons and for the truth. Neither of them know how far they will have to go, what demons they will have to face, what pain they will have to suffer.

Because the truth hurts.

Author: Gilly Macmillan
First Release: 2017
ISBN: 978-0062476821
Publisher: William Morrow Paperbacks