The Glowing by Niall Marnie

On the remote west coast of northern Norway, a series of violent deaths of young women goes unexplained, as does the later disturbance of the victims' graves. For one controversial doctor the killings make perfect sense - but if the dead are rising he must be the first to find them.
In the nearest city, descendants of an ancient human line of shape-shifting haemovores (blood-eating peoples) are outsiders to society, but can live with other humans so long as they follow strict laws and take State supplied medicines (Dreyri) to supress their desire for blood. They remain poor, abused and exploited, living with the constant threat of violence. With the doctor's help, they are plotting their escape to a new land to escape oppression and to form a new, secret colony in the Scotland.