Red Queen by Victoria Aveyard

There is a world where people with silver blood rule over the people with red blood. All red blooded people without a job when they turn 20 years old will be conscripted into the army. Mare is a 19 year old girl without a job and resorts to pick-pocketing. One day, she meets somebody named Cal who is a silver prince and he hired her to work at the palace. There, Mare found out she had powers, like the silver, but stronger than them.