It would not matter if it were my child or the child of one of my friends, what would happen at that point would be the same.
3 phone calls and most of the region I live in would be getting searched. Privately and by LEOs. Amber alerts would be on the news. I have a large network of friends and family, and we all watch out for each other's kids. That is if the kidnapper did not come to their senses and return said child imediatly. If they did and the child was returned unharmed, they would get a 24 hour head start, if not, said search would be immediate. At that point, I would pray for their sake that the police find them first. If they didn't......
I will not go into details as to what would happen once the scumbag(s) was found. All I will say is that I know a lot of type O neg donors who would line up to make it last a long time. Beyond that, I really couldn't say. I have no idea how dark the human heart can be, but I feel that I would find out. Just the thought of that scares the hell out of me.