Jonas Merrick Books in Order

The Jonas Merrick books follow an unlikely central figure for a modern spy series: an older MI5 intelligence analyst who has spent most of his life behind a desk. Colleagues nickname him the eternal flame, not out of admiration but because he never goes out on operations. He commutes, reads files, drinks tea and notices the details other people skim past.

Under the routine, though, Jonas is stubborn and quietly ruthless. He has lived with terrorism scares, Cold War hangovers and departmental turf wars long enough to see patterns. When other people rush at the latest crisis, he tends to sit back, ask awkward questions and only then move a piece on the board.

In The Crocodile Hunter he finally has to leave the office. A British recruit who fought for the so‑called caliphate in Syria is making his way back across Europe, intent on revenge for the death of his friends. Jonas spots the threat in a handful of routine reports and realises that if he does not act, nobody else will take it seriously in time. The book plays out over little more than a day as he tracks the young man across the Channel and into the south of England.

The Foot Soldiers brings him out of semi‑retirement to investigate a leak inside MI6. A Russian military intelligence officer has defected via Denmark and is almost immediately targeted for assassination, which should be impossible. Jonas is sent across the river to the glass-and-steel headquarters of the sister service to interview a small circle of officers who knew the defector's whereabouts. While he works through their stories in London, parallel chapters follow a hunted man in Scandinavia and a nervous agent in Russia, all tied together by Jonas's slow, methodical questioning.

In In At The Kill the threat shifts from state spies to organised crime. Jonas has been shuffled off to an apparent backwater, nominally working on drug gangs. From there he designs an operation to catch British and Spanish crime families on the beach as a semi‑submersible packed with cocaine comes ashore. The story cuts between Liverpool streets, a windswept corner of Galicia and the cramped life of undercover operative Kenny Blake, who has been left in place too long and is starting to fray.

The Best Revenge moves Jonas to the China desk. He tracks a deep‑cover Chinese intelligence officer cultivating a young British scientist working on a GPS‑free missile guidance system, technology with obvious military weight. At the same time, Russian military intelligence is looking for payback for earlier losses tied to Jonas's work, and men he has confronted before are dragged back into play. The book shows how old operations never quite end; they just echo in new theatres.

Across the series the tone is patient rather than flashy. Jonas is no action hero, but the people around him often are, and Seymour is interested in the friction between those worlds. Younger case officers bridle at being lectured by a man who insists on reading every line of every report; he, in turn, has little time for career management or political window‑dressing.

What links the Jonas Merrick novels is a sense that modern intelligence work is built from small, often boring tasks that occasionally tip into life‑and‑death choices. The books move from counter‑jihad operations to Russian moles, cocaine routes and Chinese espionage, but they are all anchored by one greying analyst who refuses to stop asking what everyone else has missed.

It is a spy series about paperwork, grudges and very dangerous second chances.