MI5 Officer David White has always tried to be a good father, so when his daughters want to go to a music festival in Israel, he agrees to take them. But his world falls apart when his daughters are killed in the Hamas massacre that left 1,200 innocent civilians dead. White is taken hostage down in the tunnels under Gaza, and Dan 'Spider' Shepherd and a crack SAS team are sent in to rescue him. Safely back in London, White is a changed man. He wants revenge for what happened to his family and sets out to kill the men who planned and financed the Hamas attacks. And as White embarks on a vengeance-driven killing spree, Shepherd is the only man who can stop him.