The hero of the film "Son of a Gun" in his young nineteen years is in prison. Jay did not commit Grand crimes and now he has to learn all the laws by which they live in prison. Prison life is not easy and the guy begins to mock. Known lawbreaker Brendan Lynch, deciding to protect the guy, takes him into his custody. With such a patron, Jay is not afraid of anything, and soon he must leave this place. However, Lynch does not provide assistance for nothing. Jay, released from prison, must help him and his accomplices to escape. The young man does everything that is required of him and now the criminals are at large. Now Jay is in the gang Brandon and the entire team they commit crimes. Moreover, the guy is in love with Natasha, who is also in the gang. Having stolen a lot of gold, the young people are drawn into the game of Lynch. Jay does not know who to trust and therefore there are differences. Lovers do not mind leaving the underworld, but Brendan will not let anyone go just like that. Jay and his girlfriend must come up with a plan, otherwise they will die in one day.