Orcas Island mystery
Jan G. Johnson
While spending summer vacation with their grandparents on Orcas Island, Washington, fifteen-year-old Julian and his twin sister try to discover who is behind some unusual petty thefts.

by Jessica Warman (2012)
Eighteen-year-old identical twins Alice and Rachel have always shared a very special bond, so when one is abducted the other uses their connection to try to locate her.
Jan G. Johnson
While spending summer vacation with their grandparents on Orcas Island, Washington, fifteen-year-old Julian and his twin sister try to discover who is behind some unusual petty thefts.
James C. Dekker
As Megan digs deeper into her brother's murder, she finds that Danny was "known to police" and that nobody outside of her family cares about solving the crime.
Phyllis Reynolds Naylor
After several bombs go off around town, eleven-year-old Bernie Magruder becomes suspicious of various members of his family, causing confusion in Officer Feeney's investigation and around the hotel that his parents run.
Bob Schaller
While Ashley and Adam Arlington are on vacation with their parents in Florida, they help solve an old mystery that involves the Seminole chief Osceola, the Spanish explorer Ponce de León, and the Castillo de San Marcos, a fort in Saint Augustine.