S1, E1: On her way to visit her grandfather Vic at a retirement home, an attractive mother named Leanne disappears while buying flowers from a van parked off a highway, leaving her young son and daughter alone. By the time police have been notified, the two children have also disappeared, triggering a desperate search led by Detective Iain Barclay and his sergeant, Amy Foster. As night falls, Leanne's husband Matt waits at home for news with his teenage stepdaughter Tanya, while Leanne's parents, John and Barbara, struggle to come to terms with the day's shocking events. The next day, Matt awakens to news of a discovery from a stranger named Sarah Wheeler, as well as a lead to a loner named Kyle Betts, whose mother Hazel works at the home where Vic lives.