The Night Bell by Inger Ash Wolfe

Inger Ash Wolfe is the pseudonym of Canadian author Michael Redhill.  These mysteries center around Detective Inspector Hazel Micallef who is in her sixties, a curmudgeon and often too independent for her bosses.  She  heads a small police station in Port Dundas, Ontario, is divorced and lives with her cranky mother, a former mayor of the town who is now suffering from dementia.  In several of her books she has to contend with her ex-husband and his new wife.
There are four books in this series: The Calling, The Taken, A Door in the River and her recent book The Night Bell.  To her staff, Hazel is not only a well respected detective, but also a mother figure to her youngest officer, James Wingate.  As with most police mysteries, Hazel has to manage crimes of revenge, serial killers and abuse and neglect.
It would please me if Michael Redhill would write a few more of these quickly.  Hazel is an interesting older character with quirks and doesn't suffer fools which makes her interactions interesting. The surrounding characters are realistic and the plot of her latest brings together past and present.  There are needed but some unwelcome changes at the station and in Hazel's life.  More is learned about her childhood and other members of her immediate family.  These are not cozy mysteries, and the murders can be quite vicious and bloody.  But if you want interesting characters and story lines check her out.