So you see it often enough in fiction that it's a trope. Has something like this ever happened? Has a passenger with no piloting background ever successfully landed a commercial aircraft during an emergency, with or without help from ground-based controllers?
The short answer is 'no'.
Almost all commercial aircraft have two pilots on board at all times. The chances of both the pilot and co-pilot becoming incapacitated are pretty small, especially since medical checkups are required every six months. The only exceptions are the really small puddle-jumpers such as those flown by regional airlines in archipelagos: I recall taking one flight on TropicAir where the aircraft (a Cessna 208) where the only pilot was in the left seat, the co-pilot's seat was taken by a passenger. It was a seven-minute flight, mind, so not much time for the pilot to keel over.
There have, however, been occasional incidents when non-pilots have landed private aircraft when the pilot goes down, I can think of at least six, I have no doubt there have been more. In half the cases, the passenger was a non-qualified pilot (eg they hadn't flown in years, a bit like myself) or had at least some flying experience, without having become a full pilot. The fundamentals of flying are pretty basic, one solo-flights at only ten hours of experience with an instructor (Full licenses can be granted at 40 hours, though it's not a guarantee). Even after the first hour, the basic rules are shown, it's just a matter of practice after that. After all, if you know nothing else, as long as you can find the throttle and the airspeed indicator, you can bring yourself to a survivable landing. Won't be pretty, but 'keep yourself from falling out of the sky' is good enough.
In the cases of passengers with no experience at all, you have to define 'successfully landed'. On the basis that a good landing is any landing you can walk away from, then the answer is 'yes', it is possible for someone with no experience at all to land an aircraft, being talked down over the radio, and often involving a chase aircraft to play 'follow the leader'. However, in pretty much all cases, the aircraft suffered some amount of damage. A recent incident in the UK, though, shows that, in theory, a total novice can be talked into a landing which doesn't particularly damage the aircraft. http://www.dailymail.co.uk/news/article-2451546/Grandad-John-Wildey-landed-plane-pilot-collapsed-Hero-I-just-held-joystick.html?ico=ushome%5Emostread
Some Air traffic control conversations have been recorded such as. https://www.youtube.com/watch?v=aetmIch34M4
You may have better luck asking on /r/aviation