They Disappeared

"Orla Cracken, IT whizz has disappeared. Detectives Rowan Jackman and Marie Evans soon suspect foul play. Cracken, known as Orac, is no ordinary techie; she was once a field agent traveling abroad undercover, working for the government. Meanwhile two urban explorers have mysteriously disappeared while out exploring abandoned buildings. One went missing at a disused airfield, but was it a military base, or was it civilian? The gruesome discovery of their decaying bodies in ancient church ruins bursts the case wide open, and Jackman and Evans are under pressure to find the killer. It soon becomes clear that the murderer is targeting urban explorers, but why is he determined to track down and torture these people, and how is the case connected to Orac's mysterious past?"--Provided by publisher.