沃尔特·米蒂 (Walter Mitty) 是一位有着过度保护母亲的白日梦低俗小说作家，他喜欢把自己想象成一个经历奇幻冒险的英雄。当他偶然遇到一个神秘的女人并递给他一本小黑书时，他的梦想成真了。据她说，它包含自二战以来隐藏的荷兰皇冠珠宝的位置。很快，米蒂发现自己陷入了一个令人困惑的阴谋之中，不得不承认，在现实生活中成为英雄并不容易。

Angela and Bob Brooks are an upper-class couple. Unfortunately, Bob is an unfaithful husband, but Angela has a plan to win back her husband's affections.

After Jim Barston is mysteriously killed in Australia, his wife, Helen, lays claim to the estate of Gerald Mortimer Barston in England, asserting that her husband was the missing son and heir. In reality, Jim was the cousin of the true heir, who is also named Jim Barston. Despite having no legal proof, Helen convinces the trustees to accept her claim and is installed as mistress of the manor. Jim Barston appears and proves his identity, although Helen initially believes him to be an impostor.

Someone is murdering the cast and crew of a new Hollywood movie, and the leading lady may be next. As a police detective locks down the lot and refuses to let anyone leave, the studio’s publicity head and his secretary attempt to solve the murders themselves.