ONCE YOU LET THEM IN The lights are on at the Singleton vacation home on Lopez Island, Washington, illuminating the horror within. Scott Singleton, former NFL star turned television evangelist, lies dead. The bodies of his wife and four of their five children are found on the second floor, bound, gagged, and stabbed repeatedly. The oldest daughter was shot downstairs. And the police's main suspect--the property caretaker--has disappeared. THEY WILL...