The Backyard treasure /
by Joanne Rocklin ; illustrated by John Speirs.
- New York : Scholastic, 1998.
- 1 v. p. : ill. ; cm.
- Hello Math Reader, Level 4, Grades 2&4 .
Liz the Whiz and her younger brother use codes, a chart, and a map of the backyard that matches a clock face to solve Zack's mystery. Includes a section with related activities.
0-590-30872-6
Mystery and detective stories. Ciphers--Fiction. Maps--Fiction.