Hodder and Stoughton, 2021. Good secondhand copy.

Jonas Merrick. At MI5 they call him 'the eternal flame', because he never goes out. Never goes undercover, or on surveillance, or kicking down doors. If he's studying a map, he's probably planning his caravan holiday.

But what the hot-shots fail to notice in Jonas is a steely concentration, a ruthless ability to find the enemy who hides in plain sight like a submerged crocodile, waiting for prey.

Cameron Jilkes. A young man from a broken background, trained as a Jihadi in the harshest theatre of war. Coming ashore near Dover, he plans to live unnoticed, before unleashing a terrifying strike.

And this time, Jonas Merrick must go out - to hunt the crocodile himself.