Ben Jenner is missing, and his mother Rachel will do anything in her power to find her 8-year-old son in What She Knew. As suspects come into question, including Rachel's ex-husband and perfect-in-every-way sister, she begins to put clues together herself and realises her son's kidnapper might be someone she thought she could trust the most. Gilly Macmillan will have you looking behind your back with every step you take.