Horrors from the Infinite Horizon

From publisher blurb:

A strange request reaches you that promises easy wealth for very little effort - guard a curious collection held within a museum on the estate of an extremely wealthy noble. They only need your services for one night while their usual guards are elsewhere. Yes, it seems suspicious. Yes, there is a rare celestial event occurring that night. And yes, they are very light on specifics. But easy coin is easy coin and one night in a museum isn't going to involve the end of the world, right? Right?

Do your players have what it takes to spend one night in a museum without causing the world to end?