They follow Renfield who leads them to Dracula, who is then killed because Renfield opens a window for him to escape and the light kills him. Mena recovers from being bitten and Renfield is free.
[Renfield is being seduced by Dracula's brides.]
Renfield: This is wrong. Do you hear me? Wrong. This is...WRONG ME! WRONG ME! WRONG MY BRAINS OUT!