Ten-year-old Dylan is excited when his father inherits an old lighthouse and cottage in Maine. Dylan and his family get to live there all summer! He goes sailing on the bay, explores the small town down the road, and searches for a legendary pirate treasure that was said to be buried nearby.

After mysterious things start happening at the cottage, Dylan meets Matthias, a gruff lighthouse keeper who had died in a storm one hundred years before. A ghost! Dylan is startled to find Matthias living in his bedroom, but he is glad when they become friends. It's the best summer ever!

Things change when they learn that the lighthouse is threatened by a greedy treasure hunter who also knows about the pirate legend. He will do whatever it takes to find the treasure...even kidnapping! As Dylan and Matthias struggle to protect their home, they begin an adventure that changes Dylan's life forever.