Elmer, an appealing and industrious elf who cannot be seen by people, finds a way to tell them how they can thank him for all the help he gives them.

There was once a friendly ghost, by the name of Gus, who lived in an old house in the country. Mr. and Mrs. Scott and their twins, Susie and Sammy, lived there too during the summer. Then autumn came and the Scott family left. Which meant Gus had nothing to do but sit around. One day, during a walk, he met Mouse, who was cold and hungry. "Come spend the winter at my house!" cried Gus. Thus begins an unlikely but heartwarming friendship. First published in 1962, children have delighted in this story and other Gus the Ghost books for over fifty years. Seymour Fleishman's sweet, nostalgic illustrations bring Gus, the Scotts and Mouse to life.

Gus and Mouse have moved into the Historical Museum, living there with Mr. Frizzle and Cora the cat. Late one night, Cora came in from a moonlit walk and said, "A baby ghost's outside." "What do I do with it?" Gus cried. With Cora's help and a book about caring for ghostly babies, Gus manages just fine. However, cranky Mr. Frizzle soon demands that Gus gets rid of baby ghost. How do the two caretakers of the Historical Museum settle their differences? Well it turns out that not only is Gus a friendly ghost, but a smart one too! A beloved 1972 classic has returned!