《推理要在晚餐后》是由土方政人执导，樱井翔,北川景子,椎名桔平,中村雅俊,樱庭奈奈美,要润主演的喜剧片。该电影于2013年在日本上映。带薪休假的宝生家族千金小姐丽子（北川景子 饰），好不容易和管家影山（櫻井翔 饰）乘直升飞机赶上了开往新加坡的公主丽子号豪华游轮。她在船上意外见到上司——警视厅国立署警部风祭京一郎（椎名桔平 饰），原来风祭奉市长之命护送纯金打造的K狮前往狮城。豪华一流的配套服务，让游客们乐享其中。可就在燃放烟火的夜晚，一名男子的尸体落入海中，引起不小的恐慌。在此之后，风祭、丽子、影山联合起来展开调查，而犯罪分子也以全体船员的性命相要挟禁止与外界联系。 接二连三有人遇害，时间则一分一秒地流逝，影山他们能否解开凶险的谜题？
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