They All Had A Reckoning Book by Michele Leathers

The stakes have never been higher. The games are do or die. Cory's life has become one big gamble, and he's on a path he never intended to take. Cory must decide whether he's willing to risk his life to save his friends and the one he loves, or save himself. In this deadly game of chance, Cory's life once again becomes intertwined with the girl who betrayed him. But if he's not careful or misses the clues, he just might make a wager he will certainly lose.