Gertrude Chandler Warner

The Aldens arrive at Camp Seagull, eager to participate in the camp Olympics. Someone is determined they won't win. Can they find out who?

The Aldens become involved in a community theater production of "The Wizard of Oz," which is systematically and mysteriously being sabotaged.

The Aldens take part in a hunt at a gem mine and discover that someone is out to sabotage the contest.

The Alden children suspect that the other guests are somehow involved when things begin to disappear at the bed and breakfast where they are staying in Washington, D.C.

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

When the Alden children go camping on Blizzard Mountain, a place said to be inhabited by a ghost looking for buried treasure, they begin to think someone or something is trying to scare them off.

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.

After seeing a magician perform, Benny enlists his dog Watch to help him put on his own magic show, but then both Watch and Benny's magic bag disappear.

The Alden children plan to ride in their boxcar at the Greenfield Founders' Day Parade, but the newly refurbished boxcar is stolen a couple of days before the big event.

Bad luck strikes the Aldens when they help set up an exhibit at the Greenfield Museum. The main attraction is a 4,000-year-old mummy, and the longer the Aldens are around the mummy, the more things go wrong. The children soon wonder if it has brought with it an ancient curse.