Convince Me by Nina Sadowsky

 Let me just say that this was quite the page turner. I started reading this last night and finished it this morning. Justin meets Annie when he rescues her after a car crash on an icy road. He's handsome, charming, smart--and she wonders if he might be too good to be true. But they eventually marry and he and his best friend Will launch a start-up that they hope will bring them fame and fortune. When Justin suddenly dies (this happens at the beginning of the book, so I'm not giving anything away), Annie and Will realize that they didn't know Justin at all--and his lies may destroy both of their lives.

I couldn't put it down.