Callum Challenger is a boy with a mission: to track down supposedly mythological creatures and capture their DNA. But while Callum and his friends want to save these beings, an aggressive pharmaceutical company wants to wipe them out. In this fast-paced, high-tech story, Callum and a group of misfit mates – a computer hacker, a freerunner, an ex-marine and a girl with a chip on her shoulder – criss-cross the globe, desperately trying to stay one step ahead of their enemy.