Marla sweeps into a testicular cancer support group and totally ruins our narrator's comfy world of lies. He tries to get her out of his life, but it just won't work.
One day, Marla calls our narrator because she's taken a bunch of pills in a cry-for-help suicide attempt.
The Tyler side of his personality goes over to help her.
Of course, she doesn't know he's got these two sides to his personality yet.
Marla and our narrator/Tyler enter into a physical relationship that goes pretty hot and heavy until she finds out that our narrator/Tyler has been using her mother's fat to make soap. That's a deal breaker.
They reconnect when Marla calls our narrator to check out a lump in her breast. As we know, nothing brings people together like cancer.
They talk about death a lot, like how Marla believes people are calling her from beyond the grave when she answers the phone and no one's there.
Our narrator's life spirals out of control as Project Mayhem gathers steam.
He asks Marla what his name is, and she drops the bomb: he's Tyler Durden.
But Marla isn't weirded out by our narrator's schizophrenia. She thinks it's kinda cool.
The last time we see her, she's gathered up the members of the support group and tromped to the top of the Parker-Morris building, where our narrator shoots himself to get rid of Tyler.
Even though Marla's not in the last chapter, our narrator thinks of calling her.
This time, the person on the other end won't hang up.