Agatha Sayers is a successful author whose latest novel has become a runaway bestseller. However, her joy turns to horror when her daughter is kidnapped by someone who seems to be copying the events of her book. As the police investigate the abduction, it becomes clear that there is a sinister motive behind it.
Meanwhile, Agatha's assistant, Lily, becomes increasingly possessive and jealous of her employer's success. As Agatha struggles to cope with the trauma of her daughter's disappearance, Lily begins to insinuate herself into her employer's life, determined to take over her identity and become the new Agatha Sayers.
As time runs out to find Agatha's daughter, the novelist finds herself in a race against time to solve the mystery and save her family from a deadly enemy. With a gripping storyline that twists and turns at every corner, Killer Ending is a thrilling ride that will keep audiences on the edge of their seats until the very end.