After a class trip to see the Neanderthals, Zach gets locked into the Rosencrantz Museum on the night of the new moon, the one time of the month when the prehistoric people and animals in the exhibits come to life.
It seems like a regular field trip to a natural history museum—until Zack gets locked inside for the night and discovers what really goes on in those display cases when no one is watching. A tribe of curious Neanderthals, rampaging woolly mammoths, prehistoric food shortages . . . it’s just another wild adventure for Zack!