I can't help thinking about the famous Scooby Do episode where they solved a mystery at a haunted house. Except there is no Great Dane who sort of talks to help this couple. Walt and Maggie want to restore the mansion they bought to its former glory. They didn't know about the curse. This is one of many Lady Justice books by Robert Thornhill.
Click here to watch the mansion owners unravel the mystery.
Amazon Link: https://amzn.to/2CKPpnt
Check out his website here: http://booksbybob.com/