In Cabin Fever, the Heffley family is stuck indoors during a blizzard. But will they weather the storm? 'A very tough New England winter inspired me to snow the Heffley family in for the holidays,' said Jeff Kinney. ''Cabin fever' refers to the claustrophobia Greg feels, as well as the broader theme of the book. . . that you're trapped by the identity you create for yourself.' Ages 11+.