I have an idea for a story, but am unsure if I should go through with it. It leans toward a literary style but contains fantastical rather than everyday life elements. The premise being that a man meets an immortal woman claiming to be fate itself and falls in love with her. Sounds like some typical fantasy romance, right? However, the man is oblivious to the woman's sociopathic nature. Not only that, the woman is actually a scientist who discovered immortality and eventually went insane from watching the universe destroy and recreate itself over and over again. It's not one of those stories where someone's psychological issues just disappear because someone falls in love with them, but an in depth look at how immortality could effect a person's psyche and the people around them.
Is it alright to trick the audience about what they're reading, aside from common plot twists? Or would it alienate the audience?