Matthew Reilly "The Four Legendary Kingdoms" book four in the Jack West Jr, series. 

The thrilling new novel featuring Jack West, Jr. from the New York Times and #1 international bestselling author!

A RUTHLESS KIDNAPPING

Jack West, Jr. and his family are living happily on their remote farm when Jack is brutally kidnapped and he awakes in an underground cell to find a masked attacker with a knife charging at him.

THE GREAT GAMES

Jack, it seems, has been chosen—along with a dozen other elite soldiers—to compete in a series of deadly challenges designed to fulfil an ancient ritual.

With the fate of the Earth at stake, he will have to traverse diabolical mazes, fight cruel assassins, and face unimaginable horrors that will test him like he has never been tested before.

TO HELL AND BACK

In the process, he will discover the mysterious and powerful group of individuals behind it all: the four legendary kingdoms.

He might also discover that he is not the only hero in this place...