Unholy Magic - The Charm Collector, #3

The shadows have eyes. Returning to Luma after being promised their records would be wiped clean had been a no-brainer for Harlow and company. Especially when the only requirement for hub society reintegration was to meet with Sorceress Rhiannon at the Collective's Tower to share intel about vampires, ferals, and Lachlan Shade's potential master plan. Yet within minutes of crossing the veil, Rhiannon postpones their appointment due to a brewing faction war among the sorcerers.
This welcomed reprieve is dampened by a pack of werecats barricading Harlow, Caspian, Camila, and the sword in Caspian's house until the foursome is given the all-clear to visit the Tower. Worried their side won't win the war-thereby landing Harlow and Caspian back on Luma's Most Wanted list-the pair is determined to prove they're worth more to the Collective outside a jail cell. They believe the key to a worrying surge in portal activity and a window into Lachlan's schemes both lie somewhere near Lake Nacimiento-the same lake connected to the sword's dormant twin. Their impending escape only grows more complicated when Zander Welsh drops the bomb that his days-old bite from a hybrid is infected.
Rumors are already swirling that hybrid vampires have begun turning fae-a feat previously thought impossible. In the rare instances that a fae survives the transition, their magic mutates into something unholy. Harlow and Caspian must find a cure for Welsh's blood poison before it kills him-or, perhaps worse, turns him into a monster unable to discern friend from foe.