The Hollow Sea. OutFoxing the Paranormal, #4

The dead will not be silenced. When Oscar, Nigel, and the rest of the OtP ghost hunters travel to Devil's Den Island, their job seems simple: lay the ghost of a dead medium to rest at last. But more than one ghost haunts Devil's Den, and soon the team realize there's more to the island's dark past than they've been led to believe. As the fallout from century-old secrets closes in around them, one thing is clear: the dead have a story to tell.
And ignoring it could prove fatal.