There are 4 books in the Liam Devlin series. The newest book is The Eagle Has Flown which came out in 1991.

1
The Eagle Has Landed

Book cover of The Eagle Has Landed
As the Allied forces slowly begin turning the tide of war, Hitler vehemently orders the impossible-kidnap Winston Churchill, or kill him. A crack team of commandos led by a disgraced war hero must venture into the heart of England to carry out their mission, or die trying.

Meanwhile, in a…

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2
Touch the Devil

Touch the Devil
Retired agent Liam Devlin is forced to undertake a deadly mission that involves British and Soviet intelligence, hired killer Martin Brosnan, and combat photographer Anne-Marie Audin

3
Confessional

Confessional
The character of Devlin is reintroduced in this novel of international espionage and assassination featuring Tanya Voroninova, a concert pianist and KGB agent, Morag, a beautiful gypsy, and Higgins's most unusual assassin

4
The Eagle Has Flown

The Eagle Has Flown

The breathtaking sequel to the all-time classic, THE EAGLE HAS LANDED, reissued for a new generation

The greatest World War Two story of all time - is not over...

By the end of 1943, all evidence of the abortive German attempt to assassinate Winston Churchill has been carefully buried in…