This read is unputdownable! The Rúin by Dervla McTiernan is everything is promises. Suspenseful, endearing and will have you awake in the middle of the night trying to figure out the ending. McTiernan is is also a local Perth author. Detective Sergeant Cormac Reilly is about to re-open the case it took him 20 years to forget. When a body resurface in a river in Galway he is plunged back into a cold case that has haunted him for 29 years.