A deadly mystery unfolds from New York to the Mexican border when private detective Nat Ridley is drawn into a string of ritualistic murders tied to a secret society, the Tola. With every victim marked by the same ominous double-dagger symbol, Ridley must navigate coded letters, knife-wielding enemies, and a web of deceit that stretches across nations. As his adversaries close in, and disguises become essential to survival, Ridley races to uncover the truth behind the killings-before the killers find him.