Black Leopard, Red Wolf by Marlon James

Set in Ancient Africa, a hunter named Tracker follows the scent of a lost boy and ends up working with a group of mysterious and secret individuals to try to find him — including a shapeshifting man/animal named Leopard. Their journey becomes fraught with danger when creatures have set out to kill them making Tracker wonder who this boy is and why does it seem people are intent on having him not find him.