万达纳西（卡洛尔·隆巴德饰演），布鲁克林来的一名女演员，为了土地和一个好莱坞工作室的电影演出合同，决定伪装成来自瑞典的“奥尔加公主”，登上开往纽约的客轮的猛犸象。她跑进王曼特尔（弗莱德麦克默里饰演），手风琴演奏乐队的主唱——他过去曾有过犯罪记录。他们都被罗伯特·达西（波特·海尔饰演）敲诈，之后罗伯特·达西被杀，他们成为两对谋杀案的主要嫌疑人，他们必须在有五个警察和侦探的船上找到真正的凶手…… ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Wanda Nash (Carole Lombard), an actress from Brooklyn, decides to masquerade as "Princess Olga" from Sweden in order to land a film contract with a big Hollywood studio. On board the liner Mammoth bound for New York, she runs into King Mantell (Fred MacMurray), a concertina-playing band leader with a criminal record in his past. Both are blackmailed by Robert M. Darcy (Porter Hall), and after Darcy is killed, they become two of the prime suspects for the murder, and must find the real killer before the five police detectives traveling on the ship can pin it on them.

故事发生在十六世纪的西班牙，彼时，西班牙和英国正在激烈的交战之中打得难舍难分。英国舰队的舰长理查（Lyn Harding 饰）和其子迈克尔（劳伦斯·奥利弗 Laurence Olivier 饰）遭到了地方的俘虏，然而理查和西班牙海军上将瓦德斯（Charles Carson 饰）是多年的老友，于是将迈克尔送到他家，自己却死在了敌人的炮火之下。