"Set in the world of . . . I Am Number Four series . . . Six and Sam Goode used to be part of a covert group that investigated suspicious incidents surrounding these Human Garde. Then they discovered they could no longer trust who they were working for and quit. But they'll still do whatever it takes to protect these teens. The Legacy Chronicles companion series follows them on this mission, and this book collects the next three novellas . . . In Legacy Chronicles #4: Chasing Ghosts, Six and Sam try to track down a former charge who slipped through their fingers and who may now have become much more foe than friend. In Legacy Chronicles #5: Raising Monsters, the couple must find a way to escape from an old enemy they believed was long buried in their past. In Legacy Chronicles #6: Killing Giants, a deadly master plan is finally revealed, and it'll be up to Six, Sam, and their companions to put an end to it before it's too late"--From publisher.