Blood mage

"The people of Perizzi have survived the Battlemage war, but their future is looking darker than ever. Byrne is a Guardian of the Peace, investigating a series of murders in which the corpses were drained entirely of blood. Fray's expertise with magic is needed to catch the killer, but working with the Guardians destroyed his father years before. Choss, renowned as a fighter, must work for peace and defuse a war in the underworld that will make the streets run red. Kayja must use her skills as a spy to try to prevent a massacre that will topple two dynasties and destroy the fragile peace in the city forever"--