Everything is humming at the Heartwood Hotel one year after the forest fire. Yet Mona the mouse feels like something is missing. Something besides the Golden Acorn--a legendary treasure buried and forgotten long ago. When a stranger turns up at the Heartwood with a map, suddenly the whole forest is taking part in a big treasure hunt and the hotel's regular activities are turned upside down. But Mona has an idea to get things back to normal: throw a surprise birthday party for Mr. Heartwood! As the Heartwood attracts treasure hunters--well-meaning and otherwise--and as Mona's best friend Tilly seems to be pulling away, Mona feels like her plans are slipping through her paws! Who will find the legendary treasure? And what if danger finds the hotel first? The newest installment of the Heartwood Hotel chapter book series is another cozy adventure through an imaginative woodland, complete with comforting themes and a classic feel.