For Drongo, a famous expert-analyst, the upcoming sea voyage promised to be unforgettable - of course: the islands of French Polynesia, exoticism, a huge comfortable ocean liner, striking in its magnificence... The voyage really turned out to be unforgettable, but for other reasons: instead In order to finally relax and enjoy his vacation, Drongo had to unravel another murder - a dead Russian tourist, one of the owners of the Yakut Diamonds company, Ignat Severtsov, was found on board the ship in one of the cabins. The circle of suspects turned out to be surprisingly wide - not only travelers from the Russian group were familiar with the murdered man, but also tourists from the Baltic states. And then the killer, clearly wanting to confuse the investigation, throws the key to Severtsov’s cabin into the pocket of Drongo’s jacket...