Starred Review. At the start of Smith's superb third thriller to feature Ana Grey (after 2003's Good Morning, Killer), the FBI special agent, who's still recovering from post-traumatic stress disorder after shooting a crazed detective on a suicide mission seven months earlier, learns that the skeletal remains of her missing onetime fiancé, fellow special agent Steve Crawford, have turned up in Oregon's Cascade Mountains. Ana later finds out Steve was murdered by members of an anarchist group with a penchant for homemade bombs. After training at the FBI's undercover school, Ana uses an alias to penetrate the group, which includes a former FBI agent gone bad, Dan Stone. As Allfather Stone plots a terrorist act he calls the Big One, Ana must burrow through layers of paranoia to discover the precise threat the FBI is dealing with. Ana's nuanced and coolly observational narrative voice perfectly complements the well-paced action, which builds to a satisfying conclusion that leaves open the next chapter of Ana's story