Crusty widow Annie Brennan inherits her late husband's tugboat, the Narcissus, and now makes a living piloting the craft through the treacherous waters of the Pacific Northwest, where she often clashes with rival tugboat captain Horatio Bullwinkle.

Based on the stories that first appeared in the 1920s in the Saturday Evening Post by Norman Reilly Raine, based on a real life character, and on the three subsequent movies that appeared between 1933 and 1945.