Mogi Franklin is a typical eighth-grader–except for the mysterious things that keep happening in his life. And the adventures they lead to as he and his sister, Jennifer, follow Mogi's unique problem-solving skills–along with dangerous clues from history and the world around them–to unearth a treasure of unexpected secrets.

In Outlaw, vacationing Mogi and Jennifer are taking scuba lessons at Lake Powell, Utah, unaware that two hundred feet below them is the route used by Butch Cassidy and the Sundance Kid to escape pursuers after the biggest train robbery of their career.

Meeting a history professor trying to answer questions about Butch and Sundance suddenly draws the two youngsters into involvement in an insane terrorist's incredible plan to blow up the dam holding back Lake Powell–and devastate most of the Southwest. It's not long before Mogi finds himself in the terrible situation of having to choose between preventing the dam's destruction and saving his own life.