Depending on what you mean by βlocked away for 20 yearsβ, you may never be βon the same pageβ as society.
You can still live a meaningful life, and you can still be a part of society. But being βon the same pageβ might require you to focus on helping other victims of heinous crimes.
One who has been through the darkness can help by being a guide to others who are still in or recently emerged from that same darkness.