Grace tries on Mrs. Hansen’s completed dress when Cassie shows up and surprises her by telling her the dress is for her own graduation. Vincent returns home to attend the ceremony. George works on the safe and is able to get it opened on the 13th try. Inside, Sam finds another clue to the Middleton Treasure. Vincent talks to Stephanie about selling her portion of the food truck to a popular blogger. It seems like a great fit and they both are ecstatic. Sam and Linda surprise Nick with a computer system perfect for any gamer.
Sam and Martha discover a new clue from the fireplace located in the Mayor’s office. Later, Sam and Cassie head to the tunnels under the town to find the next clue to the Middleton treasure. There, they discover a keyhole and use the key Martha previously found to open it. The two discover a music box, which they give to Martha.