Witch Is When It All Began (A Witch P.I. Mystery) (Volume 1)

Private investigator, Jill Gooder, has been hired to find a serial killer because, as usual, the police can't buy a clue. Jill, the not so proud owner of a crazy, one-eyed cat, probably can't expect too much help from her PA/Secretary, Mrs V, who spends all day knitting. And just in case all of that wasn't bad enough, Jill's just about to discover she's a witch.

...break out the custard creams.