The Bet by Rachel Van Dyken

Indulge in this "laugh-out-loud" (Jill Shalvis) #1 New York Times bestseller about two childhood enemies who--decades later--discover that there is a fine line between love and hate.

"I have a proposition for you." Kacey should have run the minute those words left Seattle millionaire Jake Titus's mouth. It's been years since Kacey's seen her childhood friend Jake, but the minute Jake mentions his ill grandmother, Kacey is ready to do anything for the sweet old woman. And if that means pretending they're engaged for her sake, so be it.

But Kacey wasn't counting on Jake's older brother Travis still being there. She calls him "Satan" for a reason: she's never forgotten the way he teased and taunted her. Yet when they meet again, Travis's gorgeous smile is a direct hit to her heart . . . and Kacey's more confused than ever. As the days pass, only one thing starts to become alarmingly clear -- she never should have accepted Jake's deal.