Van Dyken, Rachel. Covet #1

Series information from Goodreads.com

"My estranged twin brother, Julian, was always the wonder boy - and was groomed to become CEO of our ruthless father's corporation. My mother and me? Left behind. Now, years after tearing our family apart, my father dares to ask me for a favor? Pretend to be Julian while he fights to survive a tragic accident. It can save the company. Nobody will be the wiser. It'll be our secret. I can play Dad's favorite. I'll do it for Julian. And for my mother, who'll want for nothing. But this double life comes with a beauty of a hitch: my very real feelings for Julian's fiancée, Isobel. Not only am I betraying Julian, I'm deceiving a woman I love. She doesn't suspect a thing. As lies compound, lines are crossed and loyalties tested, all I can ask myself is ... What have I done? Because sooner or later something's got to give. There's no way I'm giving up Isobel. But once the truth is exposed, it might not be my choice at all."--

Bridge's estranged twin brother, Julian, was groomed to become CEO of their ruthless father's corporation. Bridge and their mother were left behind. Now Bridge is being asked to step in while Julian fights to survive an accident. It can save the company. But this double life comes with a hitch: his very real feelings for Julian's fiancée, Isobel. Pretending to be Julian means deceiving the woman he loves-- and she doesn't suspect a thing. As lies compound, lines are crossed and loyalties tested. And once the truth is exposed, Bridge will have no choice about how it ends.... -- adapted from back cover and perusal of book