A remote castle in Wales inhabited by three older men is the last place on earth that a young, lively girl of 18 would want to spend time. And yet, when forced by circumstances to take up residence there for six weeks prior to coming of age, Jessie surprises them all by finding immense enjoyment in the experience and by capturing each of her adopted uncles' hearts. As the time grows near for her to return to England, the three brothers find it necessary to trick her into prolonging her stay until a certain day. They cunningly decide to "trap" her interest by suggesting a new scheme of entertainment.