When Kaitie and Harry move into Sterling House, a big old Victorian, they never imagined what could be hiding inside, like long-lost forgotten secrets about a family on the brink of disaster, attics full of cast-offs, and a mysterious 100-year-old trunk. Katie and Harry's new-old home lies in a neighborhood of ancient elm trees, cracked sidewalks, and children who are too scared to come to their house. The sister and brother are soon having a grand time exploring, but then Kaitie finds what she thinks might be a clue from a long-ago treasure hunt. Now they are caught up in a game where each new clue becomes more ominous and they feel it must be kept a secret. Even with no one to turn to the children feel they must keep going until the end. But what exactly waits for them there? Follow them as they courageously and secretly solve the clues and find out what truths and dangers will be revealed.