The map with a gap
David D. Connell and Jim Thurman
Mathnet detectives Kate Monday and George Frankly use math skills like triangulation and scale to find a buried treasure in a ghost town.

by Ron Roy (2001)
M is for Mummy. . . .It's Mummy Monday at the museum, and Dink, Josh, and Ruth Rose are excited about the new Egyptian exhibit. It features a child mummy in an actual tomb! But then the mummy is stolen and the tomb robbed of its treasure. Can Dink, Josh, and Ruth Rose unravel the mystery and return the mummy to its rightful resting place?From the Trade Paperback edition.
David D. Connell and Jim Thurman
Mathnet detectives Kate Monday and George Frankly use math skills like triangulation and scale to find a buried treasure in a ghost town.
Donald J. Sobol
Idaville's secret weapon against lawbreakers, ten-year-old Leroy "Encyclopedia" Brown, helps the police force solve ten new cases, the solutions to which are found in the back of the book.
Madeleine L'Engle
For her birthday, Vicky receives the gift of a trip to the Antarctic, where her friend Adam Eddington is working as a marine biologist. But as Vicky meets her fellow travelers, it quickly becomes clear that some of them are not what they seem. Vicki's trip into adventure becomes a journey into icy danger.
Norah McClintock
Robyn's best friend Billy has been a mess ever since her other best friend Morgan dumped him. To make matters worse, Morgan started dating hockey star Sean Sloane right afterward. Billy is a vegetarian and an animal rights activist—he wouldn't hurt a fly. But when Sean winds up dead on the ice, Billy becomes the prime suspect. Can Robyn prove her friend's innocence?