Mt. Tam is an action adventure thriller about a natural disaster. Four hundred years ago, 38 miles off the coast of California, part of the Juan De Fuca plate was subducted under the North American plate. The cataclysmic forces from that event caused Mt. Tamalpais, in exclusive Marin County, to become an active volcano. The memories of the events are all but forgotten through time and Mt. Tam became dormant. That is, until a warm day in May when a class of 24 high school students from Sausalito and their science teacher went on a Junior Class trip.