‘WOLF.’ A single command to set off the most sinister terror plot in human history. The first book in a pulse-pounding series from Matt Rogers, a million-copy bestseller and 'a bright new talent shaking up the genre' (Candice Fox).

Ex-US black ops warrior Will Slater wasn’t looking for peace. He anticipated carnage when he decided to venture into war-torn Yemen – but he didn’t expect to have to call on his skill set so soon.

A young Yemeni boy is dead – maimed by northern highland tribesmen in the Hadhramaut Valley. The act was intended to send a message to the remote mountain town of Qasam, ordering them not to interfere with the business of the tribes. Slater sets off into the mountains in pursuit of vengeance. It was supposed to be a simple act of vigilante justice, but the boy was just the tip of the iceberg. What he uncovers spells disaster for hundreds of thousands of innocent lives.

From the foreboding caves of the Yemeni highlands to the bustling streets of inner-city London, Slater must fight tooth-and-nail to prevent an unspeakable horror, the likes of which the world has never seen.