Scorpia

Scorpia, a novel by Anthony Horowitz (388 pages) is about when Alex Rider tries to find Scorpia, a criminal organization.  When Alex finds out that Scorpia is going to kill tens of thousands of English children, he has no choice but to save the world once again.

The Tiger's Apprentice

  The Tiger's Apprentice, a novel by Laurence Yep (182 pages) is about when Tom looses the Pheonix Egg, a key to ruling the world.  To get it back he gets some of his friends to help him, and comes back barely alive.

Eagle Strike

  Eagle Strike, a novel by Anthony Horowitz (322 pages) is about when Alex (a teenage spy) looks for Damian Cray, the worlds most popular person. When Alex finds out that there is a plot to kill innocent people, he saves them with a bulletproof jacket, and a whole lot of luck.