Book excerpt: Finn Koenen, former Delta Force operator and current private investigator, wasn't really in the business of taking on cases that had already been solved - especially when they were as high-profile as this one. Last year's bombing of the Boston Marathon was certainly a tragedy, but it wasn't a conspiracy. Or was it? Unfortunately for Finn, a tantalizing clue from an unreliable witness suggests another, much more terrible attack on Boston is in the offing. He finds he can't quite ignore a nagging, unsettling feeling that he may have stumbled into something seriously dangerous. However, now he sounds as crazy as his newest client while his leads dry up faster than he can chase them down. Will Finn uncover the truth in time to prevent the deadliest attack ever made on American soil?