The Riddles of Hillgate — Zoey Kane; Claire Kane

When Zoey Kane buys eighty acres of weeds on the abandoned side of town, she doesnt expect it to contain a haunted old mansion full of questions about its past. After her business-savvy daughter, Claire, suggests they turn it into a popular hotel, somebody isn't happy about it. Now, a string of strange riddles, delivered by a ghost, must be solved before they are doomed.