Sins of the Mother by Mary E. Twomey

Serving time for a crime you didn’t commit is one thing, but being branded for life crosses the line.

The Sins of the Mother bill has everyone panicked. Arlanna and her cellmates know that they are running out of time. They need to escape, or they will be forced to have their skin seared with the details of their parents’ crimes, and their magic will be gone forever.
Arlanna never understood the reason she’s been kept away from Prince Paxton most of her life, but when they’re assigned to the same cell, she begins to see why.
Ancient magic that should have faded begins to rekindle at an alarming rate. Soon Arlanna realizes that no prison can contain the power that’s been brewing. She wants out, and she’s not going to stop until every prisoner has been freed…
…no matter the cost.