In 'What She Knew,' a psychological thriller by Gilly Macmillan, a serene walk in the park turns into a mother’s most horrifying nightmare. Rachel Jenner’s eight-year-old son, Ben, disappears after being allowed to run ahead during a seemingly uneventful Sunday stroll. As hours turn to days, and there remains no trace of Ben, Rachel’s world crumbles amidst a maelstrom of public scrutiny and media sensationalism. The investigation into Ben’s disappearance reveals truths that question the integrity of those closest to Rachel, leading her to confront the possibility that the threat may come from within her circle of trust. With tension mounting and time fleeting, 'What She Knew' delivers a harrowing journey through the intricacies of the human psyche and the desperate lengths a mother will go to in order to find her child.