In the tourist town of Morecambe, teenage twins Holly and Dylan Meredith have mysteriously disappeared. The case is assigned to Captain Lisa Armstrong, a liaison officer who specializes in supporting families in cases of disappearance. She finds herself plunged into the heart of the Meredith family and realizes she has a personal connection with them. The first 24 hours are crucial in this kind of situation. However, Lisa's total commitment and deep empathy threaten to affect her own family life. As a single mother, she finds it increasingly difficult to manage her own teenagers, especially her daughter Abbie.