NY: Harcourt,Brace & Co. (l955). lsted. B/w illus. Peter Spier. Sm.8vo. 183p. Near Fine in d/j lt.worn tips spine/top rear, soil rear. 
Set Kewanaka Bay, Long Island. During the Christmas holidays, Mark, Nora and Toby work on adding a cabin to the sloop to accomodate froemd who was recovering from polio.