Perfect getaway.

From back of book -- It's the ultimate criminal operation. For a huge fee Perfect Getaway Travel, Ltd. will provide a clean escape from the long arm of the law. To crack the ring, Frank and Joe pose as a pair of crooks looking for a safe hideout. But when they finally manage to reach the end of the line, the brother detectives find themselves trapped in a private kingdom. A garden of evil, ruled by a murderous crimelord -- where an exit visa costs a cool five million dollars.