Helen Hoang books in order

There's not enough data in the world to predict what will make your heart tick.

Stella Lane thinks math is the only thing that unites the universe. She comes up with algorithms to predict customer purchases—a job that has given her more money than she knows what to do with, and way less experience in the dating department than the average thirty-year-old.

It doesn't help that Stella has Asperger's and French kissing reminds her of a shark getting its teeth cleaned by pilot fish. Her conclusion: she needs lots of practice—with a professional. Which is why she hires escort Michael Phan. The Vietnamese and Swedish stunner can't afford to turn down Stella's offer, and agrees to help her check off all the boxes on her lesson plan—from foreplay to more-than-missionary position...

Before long, Stella not only learns to appreciate his kisses, but crave all of the other things he's making her feel. Their no-nonsense partnership starts making a strange kind of sense. And the pattern that emerges will convince Stella that love is the best kind of logic...

Khai Diep has no feelings. Well, he feels irritation when people move his things or contentment when ledgers balance down to the penny, but not big, important emotions—like grief. And love. He thinks he's defective. His family knows better—that his autism means he just processes emotions differently. When he steadfastly avoids relationships, his mother takes matters into her own hands and returns to Vietnam to find him the perfect bride.

As a mixed-race girl living in the slums of Ho Chi Minh City, Esme Tran has always felt out of place. When the opportunity arises to come to America and meet a potential husband, she can't turn it down, thinking this could be the break her family needs. Seducing Khai, however, doesn't go as planned. Esme's lessons in love seem to be working...but only on herself. She's hopelessly smitten with a man who's convinced he can never return her affection.

With Esme's time in the United States dwindling, Khai is forced to understand he's been wrong all along. And there's more than one way to love.

A woman struggling with burnout learns to embrace the unexpected—and the man she enlists to help her.

When violinist Anna Sun accidentally achieves career success with a viral YouTube video, she finds herself incapacitated and burned out from her attempts to replicate that moment. And when her longtime boyfriend announces he wants an open relationship before making a final commitment, a hurt and angry Anna decides that if he wants an open relationship, then she does, too. Translation: She's going to embark on a string of one-night stands. The more unacceptable the men, the better.

That’s where tattooed, motorcycle-riding Quan Diep comes in. Their first attempt at a one-night stand fails, as does their second, and their third, because being with Quan is more than sex—he accepts Anna on an unconditional level that she herself has just started to understand. However, when tragedy strikes Anna’s family she takes on a role that she is ill-suited for, until the burden of expectations threatens to destroy her. Anna and Quan have to fight for their chance at love, but to do that, they also have to fight for themselves.