I've read this book five times. I know it by heart and I know it by every other organ I have. 
 Lucy and Josh share an office. By which I mean that they antagonise each other via childish games like Whatcha Doing, the Staring Game, the Mirror Game. Their lives are one big whirl of constantly wanting to one-up the other because they detest each other. It all started when 
 "He did not smile back, and somehow I feel like he's been carrying my smile around in his breast pocket ever since. He's one up." 
 Lucy is the Office Sweetheart that everyone treads on a bit too often and Josh is the human version of a migraine that no one dares to cross. Here, Lucy describes it best: 
 "I bring homemade cakes to my meetings with the division heads and they all adore me. I'm described as "worth my weight in gold." Joshua brings bad news to his divisional meetings and his weight is measured in other substances." 
 All is well between them ( read: still trying to one-up each other ), until Lucy gets a date to spite Josh and there's this big promotion that they both want. It's the usual competitive crap that they both thrive on, except the stakes are bigger and they find that they may not hate each other almost as much as they thought. 
 LOVE, LOVE, LOVE IT. I'LL PASS IT DOWN TO MY GENERATIONS. AND GET MY ROOM WALLPAPERED IN THIS NOVEL 
 PROS: 
 * heroine is not a simpering miss 
 * hero is not a tortured widower 
 * hero is NOT A CORPORATE CEO!!!!! 
 * heroine and hero occupy equal positions at the office 
 * snarky commentary 
 * coke-snortingly funny (like the drink....not like actual coke although if you do snort that, I don't really mind) 
 * chemistry is world-class 
 * slow-burn AF 
 * funny as hell 
 * heroine is not an annoying perfect little paragon 
 * heroine's lipstick is called Flamethrower like what's cooler than that??? 
 * did I mention hilarious???? 
 CONS: 
 * too short 
 * no sequel 
 * no fifty page epilogue 
 * no other book by author 
 * no movie adaptation 
 * can not un-read and re-read for first time