Penny Farrell, captain and third baseman of the Hawks softball team, tries to uncover the reason for the strange behavior of two teammates who have also suddenly turned into super athletes.
Adventure and mystery find Adam and Noah when they become involved with a stolen boat, drug smugglers, a runaway horse, and a woman about to give birth on the top of a twenty-story building with a broken elevator.
Tom tries to stop his twin brother, a bumbling amateur detective, from tracking down a possible spy at a Canadian resort hotel where the brothers are employed for the summer.
During Christmas vacation at an Arizona dude ranch, Trixie Belden and the other members of the Bob-White Club help the ranch's owner learn why his workers have left so mysteriously.
A group of kids from a run-down neighborhood start using an old mansion for a club house and soon discover some mysterious goings-on involving a plot to destroy the mansion for the insurance money.
A rare Chinese vase is stolen from a pottery shop. Nancy and the owner of the shop feel that locating "the leaning chimney" will provide the clue to the vase and other stolen articles.
