February "Call After Midnight" by Tess Gerritsen

Newlywed Sarah Fontaine has just received the news that every wife fears: her husband of two months has died abroad in a hotel fire. Yet convinced he’s still alive, Sarah forges an alliance with Nick O’Hara from the U.S. State Department that has the two of them crisscrossing Europe on a desperate search for signs of life. As Sarah and Nick become quarry in the secret world of international espionage, they must risk everything for answers that may prove fatal.