sentences:  Matt was first seen in "Necropolis", when he was reading a newspaper article about a girl called Scarlett Adams who had been missing for a day after walking through a door in Saint Meredith's Church in London, England.This is the same church and door that Matt walked through in "Evil Star", and as only the five Gatekeepers can travel through that door (with one companion each), and 24 other doors around the world that take them around the world.Matt knows that Scarlett is the fifth and final Gatekeeper.