Would you risk your life to save a stranger? Discover what happens next in the Sunday Times bestselling psychological thriller, Dear Amy... A local schoolgirl has been missing for weeks when Margot Lewis, agony aunt of the 'Dear Amy' advice column, receives a letter:

Dear Amy,

I've been kidnapped by a strange man.
I don't know where I am.
Please help me,
Bethan Avery

This must be a hoax. Because Bethan Avery is another young girl, who went missing twenty years ago. As more letters arrive, Margot becomes consumed by finding the sender and - unlike the police - convinced that the girls' disappearances are connected. Solving this puzzle could save someone's life - but could it also cost Margot her own?