Tangled Up in Luck (The Tangled Mysteries #1)

Ages 8-12.   Seventh-graders Sloane and Amelia are devastated to be paired for a research project about long-lost jewels, but soon they are finding clues hidden for nearly a century--and realize they are being used.      256 pages hc

Titles in this series
Tangled Up in Luck (The Tangled Mysteries #1)
Tangled Up in Nonsense (The Tangled Mysteries #2)
Tangled Up in Mayhem (The Tangled Mysteries #3)