If you’ve looked just about anywhere this week - online, on TV, on social media, maybe even at your favorite coffee shop - it’s pretty darn clear that one thing is on everyone’s mind: Valentine’s Day. Now, whether or not you actually like this holiday, it sure does make the perfect excuse to revisit some favorite “Book Boyfriends” and “Book Girlfriends” in crime fiction—including some of the most twisted examples of love gone very, very wrong. Today’s roundup will highlight a few of the best (and worst!) relationships in crime fiction - from the tragic and endearing to the darkly funny and disturbing.