There are 3 books in the His Fair Assassin Trilogy series. The newest book is Mortal Heart which came out in 2014.

1
Grave Mercy

Book cover of Grave Mercy

Why be the sheep, when you can be the wolf?

Seventeen-year-old Ismae escapes from the brutality of an arranged marriage into the sanctuary of the convent of St. Mortain, where the sisters still serve the gods of old. Here she learns that the god of Death Himself has blessed her…

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2
Dark Triumph

Book cover of Dark Triumph
When Sybella arrived at the doorstep of St Mortain half mad with grief and despair, the convent was only too happy to offer her refuge - but at a price. The sisters of this convent serve Death, and with Sybella naturally skilled in both the arts of death and seduction,…

3
Mortal Heart

Book cover of Mortal Heart
Annith has watched her gifted sisters at the convent come and go, carrying out their dark dealings in the name of St. Mortain, patiently awaiting her own turn to serve Death. But her worst fears are realized when she discovers she is being groomed by the abbess as a Seeress,…