does anyone know this game?

A while ago, I had played this game, an RPG I believe. It was a series and In it, you played as this guy or girl, and the games were kinda scary.

In the games, you had to find clues and the more time that passed, the more something bad happened, like people turned into monsters or someone was dying or something.

In one game, you were in a museum and there was a guy being killed by gas. In another, you were on a train and some people were dying. in another, you were in a room or at stonehenge or something and there was a group of people turning into monster, and another with a chupacabra...

Do you know what this game series is?