A Hollywood actress, who had been competing with Sammy's mother for an important role, is murdered, but thirteen-year-old Sammy and her friend Marissa are on the case.
While investigating the strange digging sounds that have awakened her in the middle of the night, Caitlin discovers a few things about her family and neighbors.
In an attempt to clear up a mystery, Alec, his friend Henry, and the black stallion journey to Spain, only to find greater mystery and adventure awaiting them.