My notable find this year was an author who will serve for me as a successor to le Carré as a reliable source of thoughtful spy fiction and I have a backlog of his work to look forward to, but the first for me was:

The Crocodile Hunter by Gerald Seymour

An elderly MI5 also-ran contemptuously tagged "the eternal flame" by his bumptious young colleagues shows doggedness, courage and unexpected depth as he pursues a dangerous ISIS returnee planning an attack on British soil. Unusual and riveting.