There are 4 books in the The Harry Palmer Novels series. The newest book is Billion-Dollar Brain which came out in 1993.

'A stone-cold Cold War classic' Toby Litt, Guardian

A high-ranking scientist has been kidnapped. A secret British intelligence agency must find out why. But as the quarry is pursued from grimy Soho to the other side of the world, what seemed a straightforward mission turns into something far more sinister.…

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2
Horse Under Water

Book cover of Horse Under Water

'The poet of the spy story' Sunday Times

A sunken U-Boat has lain undisturbed on the Atlantic ocean floor since the Second World War - until now. Inside its rusting hull, among the corpses of top-rank Nazis, lie secrets people will kill to obtain. The sequel to Len Deighton's game-changing…

4
Billion-Dollar Brain

Book cover of Billion-Dollar Brain

'Dazzlingly intelligent and subtle' Sunday Times

'Worth of Raymond Chandler ... intelligent, inventive, constantly entertaining' Sunday Telegraph

Texan billionaire General Midwinter will stop at nothing to bring down the USSR - even if it puts the whole world at risk. The fourth and final novel featuring the cynical, insolent narrator…