Popsugar Reading Challenge category: A book with a rabbit on the cover
I Shall Wear Midnight, by Terry Pratchett
Terry Pratchett's Discworld books are often very funny, and this one is considered "young adult," but there are also some very grim parts, including cruelty to children and animals. Pratchett doesn't shy away from the dark. 15-year-old Tiffany Aching, a rural witch, must defeat a supernatural creature called the Cunning Man. He has the power to stir up anger and suspicion toward witches, and many of the locals get caught up in it - including Tiffany's ex-boyfriend Roland, who has recently inherited the title of Baron - and suspects Tiffany of killing his father.
Tiffany is helped - and frequently hindered - by the Nac Mac Feegle, also known as the Wee Free Men. These tiny fairies are tougher than they look, and prone to drinking, brawling, "borrowing" items, and generally making Tiffany's life difficult in hilarious ways. The book includes a side trip to the city of Ankh-Morpork, so there are "cameos" by members of the City Watch, in addition to the witches who typically appear in Tiffany's stories. Apparently the wee Free Men have something of a reputation in the city, and the Watch members are anxious to be rid of them.
Although the other witches are able to help, it's made clear to Tiffany that they expect her to prove herself by coming up with her own solution to the Cunning Man problem. She does, of course, and manages to figure out a few other problems - including her own love life - along the way.