Besides Granny and Hiram, a small dog named Blackie is the best friend Jimmy has at Land’s End. Hiram tells a fascinating story about a pirate called Pegleg, and before long, everyone is scrambling for hidden treasure. But then there’s trouble–Blackie mysteriously disappears, and Jimmy is determined to find him. When the other children join forces to help Jimmy, they discover that Blackie’s trail crosses another treasure hunter’s trail. What does the man want with Blackie? How is Blackie connected to the treasure? Will the trail lead to treasure or to danger?