Dracula Lives
1. Dracula Unborn (1977)
     aka Bloodright : Memoirs of Micrea Son to Dracula
2. The Revenge of Dracula (1978)
3. Dracula, My Love (1980)
Dracula Lives! (omnibus) (1993)

Lan-Kern
1. The Fires of Lan-Kern (1980)
2. The Destroyers of Lan-Kern (1982)
3. The Buccaneers of Lan-Kern (1983)

Sister Fidelma
1. Absolution by Murder (1994)
2. Shroud for the Archbishop (1995)
3. Suffer Little Children (1995)
4. The Subtle Serpent (1996)
5. The Spider's Web (1997)
6. Valley of the Shadow (1998)
7. The Monk Who Vanished: A Celtic Mystery (1999)
8. Act of Mercy (1999)
9. Hemlock At Vespers (2000)
10. Our Lady of Darkness (2000)
11. Smoke in the Wind (2001)
12. The Haunted Abbot (2002)
13. Badger's Moon (2003)
14. The Leper's Bell (2004)
15. Whispers of the Dead (2004)
16. Master of Souls (2005)
17. A Prayer for the Damned (2006)
18. Dancing with Demons (2007)
19. The Council of the Cursed (2008)
20. The Dove of Death (2009)
21. The Chalice of Blood (2010)
22. Behold a Pale Horse (2011)
23. The Seventh Trumpet (2012)
24. Atonement of Blood (2013)

Hound of Frankenstein (1977)
The Vengeance of She (1978)
The Ants (1979)
The Curse of Loch Ness (1979)
Zombie! (1981)
The Return of Raffles (1981)
The Morgow Rises! (1982)
Snowbeast! (1983)
Raven of Destiny (1984)
Kiss of the Cobra (1984)
Swamp! (1985)
Angelus! (1985)
Nicor! (1987)
Trollnight (1987)
Ravenmoon (1988)
     aka Bloodmist
Island of Shadows (1991)

Irish Masters of Fantasy (1979)
     aka The Wondersmith and Other Macabre Tales

The Un-dead: the Legend of Bram Stoker and Dracula (1997) (with Peter Haining) (see Bram Stoker)