Legend has it that if you stand under the path of a great blue heron, happiness and joy will follow you always. But that’s not how twelve-year-old Sam Hobbs feels when he moves with his mother to his grandfather’s isolated and lonely farm in upstate New York. Restless and bored, Sam spends his days exploring the farm. When Sam finds a mysterious magnifying glass buried in the barn, he quickly learns that it has extraordinary powers. The magnifying glass transports him back in time to 1860 and the Blue Heron Inn. But this is no ordinary inn – it’s the final station on an Underground Railroad line that moves escaped slaves over the Canadian border just to the north. And the day he arrives is no ordinary day – for the Blue Heron Inn is about to burn down, and two victims will be buried in a secret chamber beneath the rubble until their discovery sixty years later. With his magnifying glass taken from him and his life in danger, Sam must help stop the murderer, retrieve his magnifying glass, and find his way home under the path of a great blue heron.