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Benny's friend accompanies the Aldens to the South Seas for a vacation on a supposedly deserted island where they find an unusual mystery.

The Aldens, while testing the latest version of their favorite computer game, are surprised to find messages directed specifically at them.

When the Aldens go to the Pickering Natural History Museum to assist with the opening of a dinosaur exhibit, their work is hampered by a series of mysterious happenings.

The Aldens investigate when exotic and endangered animals begin to disappear from the zoo where their new friend Lindsey works.

"A talented young soccer player in Greenfield is given the honor of being a child mascot at an international soccer tournament in Brazil, but when an anonymous letter insists that she doesn't deserve to go, the Aldens investigate"--

The Alden children hunt for their late grandmother's necklace that has been missing for years.

The Alden children, isolated in a storm at a small bus station, are led into a mystery centering on a polluted river.

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

The Boxcar Children are spending the summer in an enormous New England farmhouse and the old woodshed holds a surprising secret that dates from the Revolutionary War.

The Aldens help out at a medieval fair and try to find a valuable sword which has been stolen from the fair.