Accompanying Tripper's father to Scotland where he's making a documentary about the salvaging of a treasure ship, Sam and Tripper investigate a ghostly apparition
During her career Nancy K. Robinson wrote more than 20 books for children between the ages of 7 and 12. She also wrote stories for children published by Scholastic Inc. She was a 1964 graduate of Vassar College.
I read the first two when I was in middle school and enjoyed them. Did not know about this one until I was an adult. Was disappointed in the mystery. Plus adult me wanted Tripper & Sam to hook up.