Hmm... Red drink and skull ice, ominous. It would work in thematic cafe, or on Halloween event. Do people out there really have skull ice cube mold?
I'm thinking of it's either supernatural bar with some vampires (IDK, it screams vampire to me) and inhuman beings, or it's a criminal story set on a cafe with lots of bloodshed and yeehaw bang bang, or perhaps combining both
Nimue itself is a name from legend (if not mistaken, that Lady of the Lake?) so I think it's just strengthen the supernatural guess.
I'm sorry I keep being here, I just like guessing