The Saturdays
Tired of wasting Saturdays doing nothing but wishing for larger allowances, the four Melendys jump at Randy's idea to start the Independent Saturday Afternoon Adventure Club (I.S.A.A.C.). If they pool their resources and take turns spending the whole amount, they can each have at least one memorable Saturday afternoon of their own. Before long, I.S.A.A.C. is in operation and every Saturday is definitely one to remember.

The Four Story Mistake
Into the Four-Story Mistake, an odd-looking house with a confused architectural history, move the Melendy family -- Mona, Rush, Randy, Oliver, Father, and Cuffy, the housekeeper. Though disappointed about leaving their old brownstone in New York City, and apprehensive about living the country life, the four Melendy kids soon settle into this unusual new home. Here, they become absorbed in the adventures of the country, adjusting themselves with all their accustomed resourcefulness and discovering the many hidden attractions that the Four-Story Mistake has to offer.

Then There Were Five
With Father in Washington and Cuffy, their housekeeper, away visiting a sick cousin, almost anything might happen to the Melendy kids left behind at the Four-Story Mistake. In the Melendy family, adventures are inevitable: Mr. Titus and the catfish; the villainy of the DeLacey brothers; Rush's composition of Opus 3; Mona's first rhubarb pie and all the canning; Randy's arrowhead; the auction and fair for the Red Cross. But best of all is the friendship with Mark Herron, which begins with a scrap-collection mission and comes to a grand climax on Oliver's birthday.

Spiderweb for Two
Randy and Oliver Melendy awake one fall morning full of gloom. Their brother and sister are away, the house seems forlorn and empty, and even Cuffy, their adored housekeeper, can't pick up their spirits. Will they have to face a long and lonely winter? But a surprise message in the mailbox starts a trail of excitement and adventure that takes them through the cold season. When summer finally comes around again, the children have found fourteen messages in all, and the end of the search brings them a rich reward.