The E. M. M. A. Effect A Novel
The E. M. M. A. Effect A Novel by Lia Riley is set to be published by HarperCollins Publishers on December 2, 2025. This contemporary romance novel spans 304 pages and is presented in English. The story centers around Harriet Smythe, a computer scientist who finds herself navigating unexpected feelings for her best friend’s younger brother, Gale Knight, an NHL forward. As Harriet’s elite AI training program, The E.M.M.A., suggests that the perfect match for Gale is Harriet herself, she grapples with the implications of this revelation while trying to maintain a professional relationship.
Readers will discover a blend of romance and humor as Harriet attempts to keep her feelings in check while enlisting Gale as her test subject. The narrative explores themes of friendship, attraction, and the complexities of love in a STEM setting. As Harriet’s AI program pushes her to reconsider her choices, the chemistry between her and Gale intensifies, leading to a series of awkward yet revealing outings. The E. M. M. A. Effect presents a unique take on the friends-to-lovers trope, inviting readers to ponder the balance between logic and emotion in relationships.
Official synopsis Publisher
Jane Austen meets Ali Hazelwood in this steamy, friends-to-lovers, STEM rom-com! He’s her best friend’s little brother and NHL forward. She’s a computer scientist used to being in control. The E.M.M.A., her elite AI training program, claims optimizing his performance requires one thing: the perfect match. According to its calculations, that’s her… Will Harriet discover that The E.M.M.A. knows best?
Harriet Smythe’s AI was supposed to create sports legends–not encourage her crush on her best friend’s totally off-limits, hot younger brother. But when funding runs dry, she has no choice but to enlist Gale Knight as her test subject. The same Gale she’s been secretly crushing on for years. The player who follows her every instruction with a knowing smirk that threatens to short-circuit her carefully maintained system.
Everything changes when The E.M.M.A. determines that finding Gale’s perfect match is essential to his peak performance. Even worse? According to its data, that match is Harriet.
Determined to keep things professional, Harriet makes it search for new candidates. But as Gale dutifully endures awkward outings with pop stars and athletes, the chemistry between them only intensifies. And his willing cooperation during their sessions definitely isn’t helping her stay focused.
With her deadline approaching and The E.M.M.A. still playing cupid, Harriet must choose: trust in pure logic, or admit that sometimes taking control means letting go.
Maybe The E.M.M.A. knows something they don’t–even if they’re not ready to compute it yet.
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