The Wicked Go to Hell (1961) [Blu-ray]

In a hard penitentiary two prisoners fight off the rumour that one of them denounced a recently executed inmate. With their fellow convicts at their throats they join forces and escape. Along the way, they hole up in a remote beach cabin where they take the angel-faced occupant (Marina Vlady, 2 or 3 Things I Know About Her) as their hostage while they figure out their next move.