When her husband suggested that Polina Svirskaya celebrate the New Year visiting his school friend Kirill Melnikov, she immediately suspected something was wrong, because her restless husband does not know how to rest at all! It turned out that Kirill asked Sergei, an investigator for especially important cases, for help - under the guise of a New Year's gift, someone sent a bomb to his office. The parcel was accompanied by an old postcard with white lilies and a strange inscription... Having arrived in his hometown and settled in a hotel owned by Melnikov, Sergei delved into the circumstances of the case and began to suspect that an old tragic story, about which all their classmates, had something to do with the assassination attempt on his friend, and Kirill and Sergei themselves preferred not to remember...