pray and wait peace

Call the police and report her/him as a runaway. When they are finally back home sit and talk to your kid about what is bothering them. If it's your rules they dont like you need to make them understand that they are there for a reason. DO NOT GET INTO A YELLING MATCH WITH YOUR KID! This will only make them rebel more. Seek family counciling.

Yes, I ran away in 1965 at 14 to the streets of Watt's in L.A., more later if anyone's interested.

Just try to stay in touch, they left for a reason and sending someone after them to enforce your life standards will make them run farther and hide deeper! If you can keep communication open then a resolution can be found. It may not be what You want but this is their road to travel and right now you have to let them travel it alone, just be there without judgement when and IF they need a friend. I did this @ 14, and I reestablished connection on my own. My sisters were persicuted by authorities and they went deeper, one never went back the other took 30 years. Be kind and try to accomidate there needs, both emotionally and financialy, let them know your door is open and they will always have a safe place to stay. The streets is a cold place and every ugly door will open to them and they need your strength to get them back if they go their, and DON'T JUDGE THEM and you can't understand them either unless you your self ran away, so just accept and support em the best you can, !! They need their space for now. Good luck. They will come back if you let them do it on their own terms... It's an ugly place to be but if you did your best, they will eventually understand why thing are as they are, and will always return.