Title: Mr. Z and the time clock
First published: 1986
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.
Subjects: Fiction, Mystery and detective stories, Twins, Time travel, Children's fiction
LC classification: PZ7.P94965 Mr 1986