Cross My Heart

Cross My Heart is a 2025 psychological thriller by Megan Collins.

A year after being left at the altar, Rosie Lachlan is back working at her parents' bridal salon and still waiting for the happy ending she has always believed is coming. Then a heart transplant saves her life, and she becomes convinced that the donor was Daphne Thorne — the wife of Morgan Thorne, a local celebrity author.

Rosie starts messaging Morgan through DonorConnect, an anonymous service meant for recipients and donor families, ostensibly to learn about the woman whose heart is beating in her chest. What she actually believes is that Daphne's heart makes her and Morgan a matched pair. As the correspondence loses its guardrails and Rosie digs into Morgan's marriage, she finds rumours about how Daphne really died.

A tight, uncomfortable thriller narrated by a woman whose certainty about love is exactly the problem.