The brand new Stephen Colbert is on the case.

The "Late Show" host had HBO is notoriously protective of the hit fantasy drama's secrets.

Colbert did manage to find a creative way to try to get information out of Harington. With a camera closely focused on the "GoT" star's face, Colbert peppered him with, er, interesting theories about how the show ends. It was a true test of Harington's poker face -- and to be honest, the actor failed pretty miserably.

Watch Colbert's interview with Harington below. Colbert starts sharing his theories around the 9:55-mark.

The final season of "Game of Thrones" premieres Sunday, April 14 at on HBO.