莫斯科的一座公园里发现了一具 40 岁女性的尸体。调查人员称其死于自然原因，故而不会立案开展刑事案件的侦查工作。但死者的丈夫索特尼科夫是一名银行分析师，也是一名前数学家，他坚信妻子是被杀害的。为了获得当局的支持，他自行展开了调查。索特尼科夫与医学和法律领域并无关联，不过他有着出色的数学头脑，从而成为了新领域的专家。很快，他得出了两个结论：一是他的妻子实际上是遇害身亡；二是她有一个情人。

暂无剧情简介

Pavel Gromov is the first mate on a Russian scientific ship. Pavel"s pregnant girlfriend Lena is sailing with him. The young people plan to get married after the expedition. It turns out that Pavel's friend Gleb who is a chief engineer on the same ship has been hopelessly in love with Lena. During the expedition Somalian pirates attack the ship. Gleb decides to take a chance and get rid off his rival.