(From the publisher):
The Hollisters move into their new home in Shoreham, but the moving van carrying their toys and Dad's important invention disappears. Then they find out the house is haunted and that a treasure is hidden in it. Secret staircases, mysterious strangers and a deserted hut on Blackberry Island add to the excitement.
Original title: The Happy Hollisters
Genre: Fiction→ Children & Young Adult→ Mystery