There are 4 books in the Black Magic series. The newest book is The Satanist which came out in 1974.

1
The Haunting of Toby Jugg

Book cover of The Haunting of Toby Jugg
Night after night, out there in the moonlight, Something was trying to get in at the bedroom window. A huge malevolent Something. Something not of this world. Inside, Toby Jugg, a wounded Battle of Britain pilot, thought first that he was hallucinating, then that he must be going mad, finally…
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2
To the Devil, a Daughter

Book cover of To the Devil, a Daughter
Why did the solitary girl leave her rented house on the French Riviera only for short walks at night? Why was she so frightened? Why did animals shrink away from her? The girl herself didn't know, and was certainly not aware of the terrible appointment which had been made for…

3
The Ka of Gifford Hillary

Book cover of The Ka of Gifford Hillary

Controversy rages at the Ministry of Defence. And Sir Gifford Hillary, outspoken in his views on top-secret measures to counter the threat of Soviet aggression, is partly responsible for tempers fraying.

But danger and betrayal stalk closer to home. On a warm autumn night at Longshot Hall, Sir Gifford gets…

4
The Satanist

The Satanist
For years Colonel Verney had suspected a link between devil-worship and the subversive influence of Soviet Russia. When they found Teddy Morden's crucified body, he knew his grimmest fears were justified and that world peace was also endangered.