Book 4 finds Darren and Mr. Crepsley on yet another journey, this time to Vampire Mountain, where Mr. Crepsley must present Darren to the Vampire Princes and explain his reasons for blooding a child. The journey is hard and they encounter several dangers on the way, but nothing compared to the danger Darren is put in when they arrive at Vampire Mountain. Darren must face the Trials to prove he is a worthy vampire, and during the Trials you either succeed or fail, and failure means death.