Mara, Sadie, and Hannah are friends first, scientists always. Though their fields of study might take them to different corners of the world, they can all agree on this universal truth: when it comes to love and science, opposites attract and rivals make you burn…

Logically, Sadie knows that civil engineers are supposed to build bridges. However, as a woman of STEM she also understands that variables can change, and when you are stuck for hours in a tiny New York elevator with the man who broke your heart, you earn the right to burn that brawny, blond bridge to the ground. Erik can apologize all he wants, but to quote her rebel leader—she’d just as soon kiss a Wookiee.

Not even the most sophisticated of Sadie’s superstitious rituals could have predicted such a disastrous reunion. But while she refuses to acknowledge the siren call of Erik’s steely forearms or the way his voice softens when he offers her his sweater, Sadie can’t help but wonder if there might be more layers to her cold-hearted nemesis than meet the eye. Maybe, possibly, even burned bridges can still be crossed….