When we think of spies in love, we might imagine the wacky but passionate Boris and Natasha. Alternatively, we might think of Naomi Watts and Sean Penn, depicting Valerie Plame and Joseph Wilson in the movie “Fair Game.” But what’s life really like for an undercover couple? Robert Baer and Dayna Baer know. They are two dedicated CIA agents, who had more or less given up on their personal lives, but fell in love on a mission to Sarajevo. The Baers are the co-authors of a new memoir called “The Company We Keep: A Husband-and-Wife True-Life Spy Story.” Robert Baer is also the author of “See No Evil,” which was the inspiration for the film “Syriana.”