Sammy continues to make life with her grandmother interesting as she tries to discover who is stealing from St. Mary's church, befriends a homeless girl, and plays in a softball tournament against a bitter rival.
When thirteen-year-old Sammy finds herself with an abandoned baby on her hands, she sets out to find the young mother, who may belong to a gang, and accidentally jeopardizes her position on the softball team.
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.
On Halloween night, seventh grader Sammy stumbles onto a mystery involving a twenty-year-old family feud and some heirlooms stolen by a man in a skeleton costume.
When cats begin to mysteriously disappear in Santa Martina, thirteen-year-old friends Sammy and Holly start snooping around town to find out what is happening.