The Lost Boy (original title: Fyrvaktaren) is a 2009 Swedish detective novel by Camilla Läckberg, In 2012, HarperCollins published an English-language edition, translated by Tiina Nunnally.

[1] The police inspector, Patrick Hedström, has just started working again after a long time off because of sickness.

He has been trying to relax, all the while taking care of his wife, Erica, and their prematurely born twins.

The victim is Mats Sverin, financial manager of the local council, a very friendly and beloved man.

With his coworkers, Patrick starts to redraw Mat's life, which contains more secrets than anyone would ever have suspected.