The Hunt for Dark Infinity

This is an okay book written by James Dashner. Tick, Paul, and Sofia receive a disturbing letter from Master George. He reveals that Mr. Chu from the Fourth Reality has created a diabolical weapon that is making people from all dimensions go insane. However, before the gang can properly investigate, Tick and his friends are kidnapped and forced to solve a series of challenging and dangerous riddles.

This is the second book of The 13th Reality.