When the Alden children accompany their grandfather to the Snow Haven Lodge, a series of odd occurrences threaten to disrupt the annual winter games.

While staying at a hotel in New York City, the Aldens investigate a series of annoying pranks plaguing the management and guests.

While on a camping trip with their grandfather, the Alden children try to find out about the loud music and missing food that threatens to scare away other campers.

The Aldens are excited to be playing in their summer soccer league, until someone begins sabotaging the teams.

You don't just read this ghost story. You step into it. Some houses are more than just haunted... they're hungry. Dash, Dylan, Poppy, Marcus, and Azumi don't know this at first. They each think they've been summoned to Shadow House for innocent reasons. But there's nothing innocent about Shadow House.Something within its walls is wickedly wrong. Nothing -- and nobody -- can be trusted. Hallways move. Doors vanish. Ghosts appear. Children disappear.And...

When the Alden children spend a week visiting at Pilgrim Village, they uncover the mystery behind the unusual happenings at the historic site.

While visiting a friend in New York City, the Aldens investigate the theft of a valuable diamond.

While staying at a London inn, the Aldens are puzzled by the peculiar behavior of two fellow guests, a mysterious stranger who follows them, and a misplaced antique brooch.

While visiting Chicago with their grandfather, the Alden children begin receiving mysterious clues to a treasure hunt.

When the Aldens visit Yellowstone they discover a map showing the way to an old cabin where gold is supposedly hidden, but they encounter lots of interference in their attempts to hike the trail.