The Gabriel Knight games are a set of 3 adventure games that were made in the 1990s. The first game, Sins of the Fathers, also had a remake a few years ago and you can find it on GOG here.
The original game can be found here.
The second game is the one I mentioned above, which is Gabriel Knight 2: The Beast Within and I believe to be one of the five greatest adventure games ever made; it can be found on GOG here.
The third game in the series can be found here.