Departure is the portion of the book before the hero goes on their journey. This includes events such as, the call to adventure, answering the call and crossing the threshold. David and Ryder both receive a call to adventure because, without one they would not be able to go on their journey and prove they are a hero. "Just to be on the safe side, then, it might be best if the four of you and Petra were to make your arrangements to run for it at a moment 's notice, if it becomes necessary" (Wyndham 121), when the group decides it 's best if they run away into the Fringes before anyone finds out about their deviation is the call to adventure because, it sets his path for his journey.