First, the moving van carrying their toys and their father's important new invention disappears. Next, they learn that their house may be haunted, with a treasure hidden somewhere inside! Right away they all set out to solve these mysteries. Each one of the Hollister children - Pete (age 12), Pam (10), Ricky (7), Holly (6) and Sue (4) - plays an important role in finding clues, along with their parents who are always ready to join in on the excitement. Even Zip, the collie, and White Nose, the cat, are part of the family, and find thrilling adventures of their own. As the Hollisters explore their new town and make friends, they discover what happened to the moving van, and learn more about the mystery surrounding their new home. Excitement abounds when a secret stairway is discovered. Then, on the trail of a mysterious intruder, their chase leads them to a deserted hut on nearby Blackberry Island. Over seventy action-packed illustrations make the story- and the Hollister family- so vivid that the reader has a feeling of really sharing in on the adventures of this lovable and interesting family.