What She Knew is a gripping psychological thriller by bestselling author Gilly Macmillan that keeps readers on edge from start to finish. The novel follows the terrifying story of a young boy who goes missing after a simple trip to the park, and the devastating impact it has on his mother and the people around her.

As the investigation unfolds, secrets come to light and trust begins to crumble. The story masterfully explores fear, guilt, and the fragile nature of memory, asking the haunting question, How well do we really know the people we love?

Packed with suspense, emotional depth, and shocking twists, What She Knew is perfect for fans of dark thrillers, crime fiction, and intense psychological drama.