The Private Collection

Go to the second door and you'll see that it's a trap.Kill every one.Don't try to use the lever because it's useless for now.When you go back to slim he'll apologize and give your money back.Then he'll disappear for a while.If you can't take your money back (there is a bug in the game) go back to place you trapped.Use lever etc and than go back to Slim.Bug will be cleared.