Mr. Z and the time clock
By: by Bonnie Pryor.
Publisher: Dillon Press
Published: 1986
Place of publication: Minneapolis, Minn
Language: eng
Number of pages: 117
Subjects: Mystery and detective stories.; Time travel -- Fiction.; Twins -- Fiction.
Description: When twelve-year-old twins become owners of a time clock, they begin traveling back and forth through time, trying to solve the mystery of the strange Mr. Z who is a sinister presence in their lives.
Notes: "Gemstone books."