I was attracted by the title, and then I went and looked it up! I did not know that a group of ravens is known as an "unkindness" meaning a sort of conspiracy.
A murder mystery, setting is a library and Greer Hogan who has a habit of finding murdered bodies on her doorstep literally opens a door and a body falls out. The story takes off from there with theories abounding as the body count rises and Greer has to also take a step back and think carefully, whether her previous testimony actually sent an innocent man to jail.
This was a good debut novel. Quirky characters and the library setting was particularly good. This was no modern library but a rather character filled scenario with a long history.
Sent by Crooked Lane Books for an unbiased review, courtesy of Netgalley.