6. - Trixie Belden #3: The Gatehouse Mystery by Julie Campbell.
Trixie and her friend Honey find a diamond in the dirt of the old abandoned Gatehouse of Honey's estate. With the help of Jim, Honey's adopted big brother, and Trixie's older brothers, Brian and Mart, now home from camp, they piece together the clues to find out who had stolen the diamond and dropped it in the Gatehouse.
Another fun adventure with these young teens. The amount of time they allow younger brother Bobby to spend time alone with a total stranger (Honey's new chauffeur, aptly named "Dick") is another example how today isn't the 1950's.
VirginiaR. "On the long road, take small steps." -- Jor-el, "The Foundling" --- "clearly there is a lack of understanding between those two... he speaks Lunkheadanian and she Stubbornanian" -- chelo.