Die for You by Lisa Unger

Successful novelist Isabel had pretty much resigned herself to the single life when she meets Marcus Raine. They marry and are happy for five years--then one day he disappears. Knowing something is wrong, she tries to trace his movements and ends up injured in the hospital with the police questioning her about her husband. Marcus grew up in the Czech Republic and came to the United States for college. It soon becomes clear that Marcus was keeping lots of secrets from her and that he wants Isabel to forget about him. But Isabel knows that she must know the truth about the man she married, even if it leads her into grave danger. Die for You is a page turner with more depth of character for Isabel and her family than you might expect.