The key to saving the world could be the one thing out of Duff's reach...It's an impossible situation. Time itself is coming apart at the seams, and Duff and the Z-Crew suspect the key rests with one girl: Horizon. The problem? Horizon is the long-sought-after daughter of their nemesis, Ravenne. She stopped at nothing to retrieve her daughter from the past. Now it's clear sending Horizon back is the only way to repair the rift, but her mother won't let her go. The underground artifact where they accidentally created the rift is crumbling.No one will survive unless they can escape the mountain falling down around them, but time is shuddering and echoing around them, and the way out isn't clear. To make things worse, thanks to the unpredictability of time rifts, the crew now faces not just one mortal enemy-there are two Ravennes working against them.Will Z-Crew escape Ravenne's clutches and set time right again, or will Duff finally have to bend to his enemy's will? Find out in the next installment of the Relic Saga!This book is best enjoyed after the first two books.