Strange Practice by Vivian Shaw, 385 pages

Dr. Greta Helsing has inherited the family's highly specialized, and highly peculiar, medical practice. She treats the undead for a host of ills-vocal strain in banshees, arthritis in barrow-wights, and entrops in mummies.
It's a quite supernatural-adjacent life, until a sect of murderous monks emerges, killing human and undead Londoners alike. As terror takes hold of the city, Greta must user her unusual skills to stop the cult if she hopes to save her practice-and her life.