Between 1985 and 1987, the Polish Security Service launched a secret operation called "Hyacinth" to track and detain gay men in the country. About 11,000 people were entered into the database, and they were threatened and blackmailed one after another. And it all started with a confusing murder case. A wealthy businessman was killed in a villa, and the process of chasing the murderer was full of mystery. The male protagonist Robert is a young policeman. Although his father is the chief police inspector, he can't stand nepotism and is very serious about solving the case, hoping to find out the truth behind it. Robert went undercover in the gay circle without telling his fiancée and met Eric, an outgoing male college student. Eric is a bold and confident young man who has received a Westernized education. He naturally trusts Robert, complains to the latter about the meanness of the Hyacinth Operation, and reveals some inside information related to the murder. After feeling his partner's inner depression, Eric told Robert that people should not be afraid of everything, especially freedom...As Robert's investigation deepened, he found that there was a huge money and sex network behind the rich businessman, and his obsession with Eric brought him a fatal disaster...