Jennie Levinsky has an amazing secret -- and only her best friend, Beth, knows about it. Jennie can "hear" what her neighbor's sheepdog, Sam, is thinking! And what Sam is usually thinking is how to find fame and fortune as a world-famous detective. With Sam: Dog Detective as their fearless leader, the girls snoop their way into trouble, but quick thinking and swift action always lead them to safety. In The Ghost of Captain Briggs, Sam and Beth join Jennie's family on their summer vacation at an old mansion built by a fierce pirate. Sam's convinced that where there's a pirate, there must be a buried treasure and a ghost!