The drowning isle / Simon McCleave.

"On a remote island, there's nowhere to run-- When a teenage boy goes missing on a camping trip with his friends, the close-knit community of Anglesey is shaken. DI Laura Hart is brought in to lead the murder investigation and instantly feels the pressure, not least because her colleague's son was the last to see the missing boy alive. Laura's investigations force her to delve into the tangled web of relationships and personal lives of her own neighbours. The trail leads her to uncover a religious cult called The Fair Men, who locals say have a dark history and still hold their ceremonies on the island where the boys were camping. But could it be that yet more secrets are hidden behind closed doors? Amongst all the mysteries and lies, Laura is sure about one thing: the island will not give up the truth easily."--Publisher.