The story revolves around a woman named Sasha Meshcheryakova. She gets a job as a cleaner in the police department of a small town called Kalinova. She wants to leave behind some events from her past life, which were connected to crimes, and prefers to simply mop the floors in the office. Previously, Meshcheryakova worked as a profiler and assisted in capturing several criminals, but after an unfortunate incident, she decided to quit the profession. However, soon Sasha is in for a new and unexpected twist in her life...