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The first three books in the series of police procedurals featuring British detective DI Yvonne Giles :

Book 1 : Death Master
British detective Yvonne Giles desperately hunts a disturbing serial killer who is taking apart young women.
Just as she feels she's getting somewhere, she finds herself in the killer's sights. 
(A dark, murder mystery thriller, set in Wales).

Book 2 : You Will Die
DI Giles delves into terrorism and old legend in a race to stop the murderer of welsh village priests. 
A serial killer who taunts police with cryptic inscriptions on the victims' bodies. 
(An atmospheric, dark crime police procedural, set in Wales)

Book 3 : Total Wipeout
Someone is killing whole families and making it look like murder-suicide. 
British detective Yvonne Giles knows it. Trouble is, her superiors don't. She goes maverick, to hunt the killer amongst a mysterious masonic ring and players in high finance. 
The killer has the next family in his sights.
(A dark murder mystery, police procedural set in Wales)