Has a family plea to a kidnapper ever worked?

There’s a story on tv right now about such a case.
The police always reccommend the family to plead, but I never hear of a kidnapper responding.
Does it happen?

Last year a kidnapped toddler in Nigeria was released without ransom, but factors other than kidnapper remorse came in to play.

Sometimes things are done simply to make people feel like they are doing something to help. I would guess that this is one of those things.