I recognised it, but had to do a bit of searching because I couldn't remember the title.
It's
Night Errant by Meredith Knight
Lois dropped Clark off at his apartment with the hard copies of the
Luthor file not long after Perry and Jimmy departed. She sat down to
an evening of Chinese take out and research on her laptop as she
poured over the documents carefully, looking for any clues. She
removed her reading glasses and rubbed the bridge of her nose. A
knock at the door startled her. She quickly closed up all of the
files and turned off the laptop. She walked to the front door and
looked the through the peephole. She felt her stomach clench and her
heart slammed against her rib cage. Slowly, she exhaled and opened
the door.
This is one of my favourites I definitely recommend it if you haven't already read it!
