MI5 officer David White was always a good father, so when his daughters want to go to a music festival in Israel, he agrees to take them. But his daughters are killed in the Hamas massacre that left 1,400 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. Back in London, White is a changed man. He wants revenge for what happened to his family and wants to kill the men who planned and financed the Hamas attacks.

And as White embarks on a killing spree, Shepherd is the only man who can stop him.