The Stuffed Bear Mystery (Boxcar Children Mysteries, 90)

The Tunnel of Bones (Double Detectives Book 4)

The Hayley Mysteries: The Missing Jewels (The Hayley Mysteries, 2)

House Arrest (Mystery Files of Shelby Woo, No.6)

Puzzle Adventure Omnibus: v. 2 (Usborne Puzzle Adventures): v. 2 (Usborne Puzzle Adventures)

The Lucy Wilson Mysteries: The Children of January

The Happy Hollisters on a River Trip: (Volume 2)

The Sinister Signpost

Four orphaned siblings make a home for themselves in an abandoned boxcar.

The Boxcar Children

The Boxcar Children have entered the Ruby Hollow Gem  Mine's annual gem-hunting competition. With a little instruction and the  right gear, the Aldens have everything they need to become real rock  hounds! They have a natural talent for rock-finding, and it's not long  before Jessie makes a fabulous find. But before she can enter her ruby  in the competition, it disappears! Could there be a thief at the mine?  Now, instead of digging for rocks, the Aldens are digging for clues. Who  wants to win the contest so much that they would steal from the Aldens?  The children don't know, but they're determined to find out!

Problem-Solving

Teamwork

Curiosity

The Mystery of the Star Ruby (The Boxcar Children Mysteries)

Discover Your Child's Next Read

The Stuffed Bear Mystery (Boxcar Children Mysteries, 90)

Aimee Lilly, Gertrude Chandler Warner, 2002

The Tunnel of Bones (Double Detectives Book 4)

Zack Norris, 2012

The Hayley Mysteries: The Missing Jewels (The Hayley Mysteries, 2)

Hayley LeBlanc, 2022

House Arrest (Mystery Files of Shelby Woo, No.6)

Lydia C. Marano, 1998

Puzzle Adventure Omnibus: v. 2 (Usborne Puzzle Adventures): v. 2 (Usborne Puzzle Adventures)

Martin Oliver, Michelle Bates, Karen Dolby, 1994

The Lucy Wilson Mysteries: The Children of January

Tim Gambrell, 2021

The Happy Hollisters on a River Trip: (Volume 2)

Jerry West, Helen S Hamilton, 1953

The Sinister Signpost

Franklin W. Dixon, 1936