Killing Me Softly, a novel by Nicci French
Blurb: Alice Loudon has a wonderful boyfriend, Jake; a nice apartment in London; good friends; and a satisfying job as a research manager in a pharmaceutical company. On her way to work one morning, she locks eyes with a handsome man dressed in black, and cannot get him out of her mind. Later that day, she finds him waiting for her and she plunges into an affair of such intensity that she leaves Jake, neglects her friends and her health and even puts herself in great danger.
This psychological thriller was adapted to film in 2002.
It starred Heather Graham and Joseph Fiennes.
Personally, I've never read the book or seen the movie. Have You?
Yesterday's Trivia Answer: The bears name in The Jungle Book is Baloo.