A Pocket Full of Murder by R.J. Anderson

Isaveth lives in a world where citizens may perform common magic, but only nobles may use more powerful spells. However, most people don't practice magic, so she helps her widowed father by selling spell tablets. Then, the Lawkeepers arrest her father for the murder of Master Orien. Isaveth knows everyone already thinks he's guilty, so it's up to her to prove his innocence. A secretive boy named Quiz comes to her rescue one day, and he becomes her partner in solving the mystery. They discover Master Orien was killed by noble magic, and the murderer must be a very powerful person in the kingdom. The search leads them to the darkest parts of the city as well as the most regal parts. The suspects become fewer, but Isaveth doesn't know who she can trust.

This book has a lot going on and addresses many issues of society. There's obviously the murder, but the plot also deals with religious freedom, the haves and the have-nots, bullies, and governmental corruption. Isaveth's family must keep its religious beliefs secret, and it's part of the reason her father is arrested. The government keeps the citizens from having a right to vote, and many of them are working to change the laws. Quiz seems to be a positive main character, but his secret life leaves that in doubt. The book reads like a mystery, as the main plot deals with solving the murder.