Rocklin, Joanne.

The case of the backyard treasure / by Joanne Rocklin ; math activities by Marilyn Burns ; illustrated by John Speirs. - New York : Scholastic, 1998. - 1 v. (unpaged) : col. ill. ; 23 cm. - Hello reader! Math. Level 2 .

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.

ISBN: 0590308726

LCCN: 97011462

Subjects--Topical Terms:
Mystery and detective stories.
Ciphers--Fiction.
Maps--Fiction.

LC Class. No.: PZ7.R59 / Caf 1998

Dewey Class. No.: [E]