At the close of World War II, Kansas newspaper editor Frank Hamilton and his wife Jane are taking a long-awaited month's vacation on Grand Lake, Colorado. Accompaning them is their 11 year old granddaughter, Maggie and their maid Alma, who has come along to manage Maggie. Maggie believes that she must uncover and solve a mystery to make her vacation complete and sets her sights on a neighbor's reported missing squash blossom necklace.