Trixie Belden and the Gatehouse MysteryBook - 1961
When Trixie and Honey explore an abandoned gatehouse, they discover more than dust and spiderwebs. Stuck in the dirt floor is a huge diamond! Could a ring of jewel thieves be hiding out in Sleepyside? "From the Hardcover edition."
Publisher: Western, 1961.
Characteristics: 234 p. ; 19 cm.
Alternative Title: Gatehouse mystery.