Demolition Ya Ya

Finn McKenna is melting and he doesn't know why. He wakes up in the desert with nothing but a phone number written on his arm. He calls the number and the person who answers is immediately killed. Just before taking their dying breath, the voice informs him that he is a competitor in some ultraviolent game show, but for the life of him he can't remember what it is he is supposed to be doing. Even worse, everyone around him seems to know who he is and what has happened to him, but the only ones who offer help have ulterior motives. Surely there's someone he can trust, but can he find them before his body completely drips away?