Naturally, there's someone or several someones in Blackpool who don't want the documentary to be made. They'd prefer that the past remain unexplored. Right away, there's a murder. The police would naturally prefer that the Grahams stay out of things, but there's plenty of room for their amateur sleuthing, and they prove to be very good at it in spite of some blunders along the way.
Stolen Away is the first book in a series, so there are things being set up to pay off in later installments. The book works just fine on its own, though, with clever plotting, sympathetic main characters, and great pacing. If you like your mysteries a little on the cozy side, this is one you'll want to check out soon.