While visiting Lake Misty Pines, the three cousins hear about an archaeological treasure that may lie on the island in the middle of the lake and try to track a mysterious stranger.

97-517 When the three cousins find some strange symbols carved in an old tree, they start learning about hobo code and in the process learn about the importance of kindness as well

Sarah-Jane and her cousins try to find out why an antique doll was left at her backdoor.

Titus and his cousins are taking care of their neighbors' crabby Yorkshire terrier when the dog suddenly becomes sweet-tempered and the cousins have a mystery on their hands.

His neighbor's new African gray parrot gives Titus and his two cousins a new mystery to solve.

97-518 While celebrating "Christmas in July," the three cousins come into some stolen art works and discover that even bad boys can be good.

When he takes his neighbor's Maine coon cat to a ceremony for the blessing of animals, Titus finds a mysterious note in his pocket and with the help of his cousins determines its source.

Three cousins endeavor to find out who gave a painting entitled "Sabbath Day" to their grandfather for a birthday present.

A pet ferret becomes the prime suspect when Titus and his cousins investigate the disappearance of a treasured swimming medal.

While attending a fancy wedding, the three detective cousins investigate the mysterious disappearance of the wedding cake.