Joanna and her young son, Alfie, are moving to a quiet town of Flinstead in search of a fresh start. However, they quickly find themselves entangled in the lives of local mothers and the unsettling dynamics of the community. When Joanna discovers an online rumor about a child killer living in the town, she uses it to win over the mums at the school gate. As the rumors spread, suspicions build, and Joanna finds herself drawn into a web of secrets and paranoia. Balancing her efforts to protect her son with the growing unease in town, Joanna struggles to distinguish between truth and hearsay. With relationships strained and emotions running high, the boundaries between trust and fear blur. The Rumour explores how quickly small-town gossip can spiral out of control, forcing Joanna to confront the unforeseen consequences of curiosity and mistrust in her search for answers. The story is based on the Sunday Times bestselling book by Lesley Kara.