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.
- ISBN10 087518328X
- ISBN13 9780875183282
- Publish Date 1 January 1986
- Publish Status Out of Stock
- Out of Print 2 October 2008
- Publish Country US
- Imprint Dillon Press
- Format Hardcover
- Pages 117
- Language English