On the Edge — Matt Christopher

avier 'X' McSweeney has been working hard to conquer his fear of heights. Ben, an experienced rock climber, is teaching him how to boulder across the surface of a gigantic rock. X arranges for Ben to teach his friends Bizz Juarez and Jonas Malloy about rock climbing, too, but at the last minute Ben can't make it. Rather than disappoint his friends, X decides to show Bizz and Jonas what he's learned... It's a decision that nearly leads to disaster.