Professor Lucas vs Professor Laytons

Once upon a time, there were two gentlemen who were fond of riddles and good tea.
Two professors who had never met.
Until one day they took the same case: A lost city not mentioned on any map of the world.
Strange things were happening there, the city had a heavy past, and a dark enigma inhabited it.
And to solve it, the city was waiting for only two people: Professor Lucas and Professor Layton.
And to solve the riddle, the two men would have to face each other to unravel the mystery that weighed on this city.