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!

Zack, trapped overnight in a museum of natural history, learns to his dismay that the Neanderthals and other 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!

The Zack Files #25.

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.

Zack is nervous about the fifth-grade Halloween dance. He doesn't know how to dance and he doesn't have a date! When Zack meets Prudence, a beautiful girl who speaks with a funny accent and dresses in old-fashioned clothing, he's smitten. He thinks he's found the perfect date for the dance! Prudence is so different from the rest of the kids he knows. She's actually come from the past-the year 1692 to be exact-and she's fleeing the Salem witch trials! Will Zack and Prudence even make it to the dance, or will she have to return to the past? Read on to find out!

"My clone looks like me. My clone talks like me. He helps me with my homework and takes care of my bullies. And he could be the answer to all my problems. Or he could be my biggest one yet!