The shadow of 9/11 looms large over Terry Hayes’ debut novel, in which a covert agent — the greatest agent of all time, even, we’re told — is pulled back into service to hunt down a terrorist no one has ever seen. At the same time, he gets pulled into the investigation of a brutally perfect murder in post-9/11 New York, a murder that was committed using the very same techniques he once wrote about. Hayes’ background as a journalist is readily apparent; I Am Pilgrim is filled with detail as our agent, the titular “Pilgrim,” jaunts from New York to Turkey to Saudi Arabia in his pursuit. But Hayes can’t resist piling on the twists and turns, including another murder mystery as well as the various ghosts and demons from Pilgrim’s past and upbringing. As such, the novel becomes unwieldy and even ridiculous at times, and there were moments — such as when Pilgrim describes the sexual prowess of one of his alter egos, or when Hayes belabors the moral ambiguity inherent to espionage — when I was sorely tempted to stop reading altogether. In those moments, the novel felt more akin to juvenile wish fulfillment than a mature and bracing spy thriller. Still, in the end, I was pretty consistently entertained even as it felt like I Am Pilgrim had a fair amount of fat that could’ve been trimmed.