#22 Gods of Jade and Shadow by Silvia Moreno-Garcia

Set in Mexico during the Jazz age a girl runs away with a death god she freed from a chest in her Grandfather’s house. Casiopa and her mother are treated like servants by the rest of the extended family living her Grandfather’s house. One day when everyone is out she sneaks a look into a always locked chest and wakes the god imprisoned within when she is cut by a bone shard that is stuck in her hand. The god is now tethered to her and she leaves with him on a journey to have him defeat his brother and reclaim his throne in the Mayan underworld. Casiopa and Hun-Kame travel around Mexico and end up in the USA on his travels to find his missing parts and defeat his brother. A good quest storyline using Mayan mythology makes for a fun read.