Cassie encourages Sam to keep his eyes open for mysteries to unlock, just as Martha unearths a long lost town charter with a hidden treasure map. Vincent heads out in search of the treasure, leading to an unexpected competition with another treasure ... (more)seeker. Grace is hurt when she learns that Luke had been spying on Abigail for his aunt Donovan's mother, Dotty. Abigail continues to spar with her, until a crisis makes her reassess her relationship with Donovan. Meanwhile, Adam helps Stephanie with the launch of her food truck.