This is Prisoners Week. Here is the official Prisoners Week Prayer:, though I'm sure the Lord would be at least as happy with an unoffical one, if it's from the heart.
Lord, you offer freedom to all people. We pray for those who are captives in prison and those who are affected by or involved in their imprisonment. Break the bonds of fear and isolation that exist. Support with your love: prisoners, their families and friends, prison staff and all who care. Heal those who have been wounded by the activities of others, expecially the victims of crime. Help us to forgive one another, to act justly, to love mercy, and walk humbly together with Christ in his strength and in his spirit now and every day. Amen.