There are 11 books in the Sister Joan Murder Mystery series. The newest book is A Vow of Devil which came out in 2021.

When one nun dies in a bizarre accident and another disappears, hushed whispers of virgin sacrifice, Mother Goddess worship, suicide, and murder spread among the Sisters at Cornwall House convent and Sister Joan is sent to investigate
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2
A Vow of Chastity

Book cover of A Vow of Chastity
With a killer stalking the moors near their convent in Cornwall, Sister Joan must battle the forces of evil threatening the nuns, as well as the temptations elicited in her own heart by the cynical police officer on the case

3
A Vow of Sanctity

Book cover of A Vow of Sanctity
While on a spiritual retreat in Scotland, spirited nun and amateur detective Sister Joan makes the shocking discovery of a modern skeleton in an ancient crypt

4
A Vow of Obedience

Book cover of A Vow of Obedience
Sister Joan of the Order of the Daughters of Compassion returns in a mystery that begins when she finds the body of a girl in a bridal gown and learns of the murderer's strange connection to another nun

5
A Vow of Penance

Book cover of A Vow of Penance
With Father Malone off on sabbatical and a replacement on scene, Sister Joan joins forces with her old friend Detective Sergeant Mill to investigate vandalism at the convent and the supposed "suicide" of Father Malone's housekeeper.

6
A Vow of Devotion

Book cover of A Vow of Devotion
⭐⭐⭐⭐⭐ “The whole series is very enjoyable.” Dragones

DISCOVER A DRAMATIC AND ENTERTAINING NEW MYSTERY SERIES SET IN A CORNISH CONVENT.

Two newcomers are visiting the convent in the hope of joining the nuns. But soon after their arrival, there’s a mysterious late-night intruder. Who left the single red rose…

7
A Vow of Fidelity

Book cover of A Vow of Fidelity
An outstanding addition to the Sister Joan series. 'A promised series.' - KIRKUS REVIEWS 'The most refreshing and likeable of the genre's non-sleuths.' - PUBLISHERS WEEKLY The Daughters of Compassion plan to turn the postulancy in their convent into a venue for week-long retreats, and Sister Joan is instructed to…

8
A Vow of Poverty

Book cover of A Vow of Poverty
In the midst of trying to raise funds for the Order of the Daughters of Compassion, Sister Joan finds out that two teenagers have been murdered and that someone has been sneaking around the convent, and sets out to unlock the mystery.

9
A Vow of Adoration

Book cover of A Vow of Adoration
In this ninth volume in the series, the unconventional nun Sister Joan risks her life while learning the difference between adoration and infatuation during the investigation into two murders that took place near her convent. BAKER & TAYLOR

10
A Vow of Compassion

Book cover of A Vow of Compassion
A series of unexplained deaths and the sudden disappearance of a child from a Cornish hospital cause Sister Joan to begin an investigation into the matter in order to put an end to the strange and deadly events.

11
A Vow of Devil

Book cover of A Vow of Devil
DISCOVER THE BREATHTAKING FINAL BOOK IN THE BESTSELLING SERIES

“It's an awfully long time since Sister Joan found a dead body.”

These are the words of old Sister Gabrielle, but she may have spoken too soon . . .

There is clearly something weird going on in their quiet corner…