Oleg Rubtsov, nicknamed Pilgrim, is a former special branch officer who was involved in complex and sensitive investigations and operations. Due to the betrayal of the "mole", the agents' data was declassified, and almost all of Rubtsov's colleagues died. Oleg managed to survive and protect his wife, but now he has to constantly move and hide. Obsessed with finding a traitor, the Pilgrim tries to rediscover his place and purpose in life.