Release Message: 

Description:  Seventh-grader Dorso Clayman opens his locker door to find a dead body. Thirty seconds later it disappears. It's not the first bizarre thing that has appeared in his locker and then vanished. Something's going on. (Grades 3-7) Somebody has decided to make Dorso and his buddy Frank the target of some strange techno-practical jokes. The ultimate gamesters have hacked into the time line, and things from the past are appearing in the present. Soon, the jokes aren't funny anymore „ they're dangerous. Dorso and Frank have got to beat the time hackers at their own game by breaking the code, before they get lost in the past themselves.