The Kiss Quotient Books in Order

The Kiss Quotient is a contemporary romance series about people who want connection but do not always know how to ask for it. Each book follows a different central couple, while recurring relatives and friends gradually make the world feel more connected. The stories are linked most closely through the Diep family, but each romance has its own complete emotional arc.

The series begins with The Kiss Quotient. Stella Lane is a successful econometrician who approaches life through data and careful systems. Dating has never felt simple to her, so she hires Michael Phan, an escort, for practical lessons in intimacy. Their arrangement gives the book its lively setup, but the real tension comes from what happens when both of them begin to want more than a set of rules can handle.

In The Bride Test, Michael’s cousin Khai Diep believes that his autism means he cannot experience love in the way others do. His mother travels to Vietnam and brings Esme Tran to California as a possible bride. Esme sees the trip as a chance to build a better future for herself and her family, while Khai sees an impossible disruption to the life he has carefully arranged. Their story mixes family matchmaking, immigration, cultural expectations, and a slow shift toward honesty.

The Heart Principle turns to Anna Sun, a violinist struggling with burnout after unexpected online success, and Quan Diep, the tattooed, motorcycle-riding man she meets while trying to break out of a stale relationship. It is the most emotionally intense book in the set. Anna and Quan’s relationship has to make room for exhaustion, grief, family obligations, and the difference between being wanted and being truly supported.

These are open-door romances, but the relationships are never treated as easy fixes. Hoang lets her characters misread each other, retreat when overwhelmed, and wrestle with the expectations placed on them by work and family. Autism and neurodivergence are central to several characters’ experiences, while Vietnamese and Vietnamese American family life gives the series an important sense of community and history.

The books can be read as standalones, but chronological order is the best choice for readers who enjoy familiar faces and small connections between couples. Start with The Kiss Quotient, continue with The Bride Test, and finish with The Heart Principle. Expect funny, sexy, emotionally direct romances with more weight beneath their playful premises.