Masterpiece in Blood. Hourglass Series, #5

The ritual is over. The war has begun. Detective Cora Cross has spent her career hunting the Pact, but the shadow society is tired of being hunted. Their final design is no longer about single victims or hidden galleries-it's about the city itself. In a ruthless display of psychological warfare, the survivors of the Pact are turning the streets into a canvas and the evidence into a cage. As public trust in the police collapses, Cora finds herself the prime suspect in the very chaos she's trying to stop.
Framed for the mounting body count and stripped of her shield, she realizes the killers are building toward a "Grand Exhibition"-a catastrophic finale designed to immortalize their ideology and leave Cora as the face of the tragedy. To prevent the city's destruction, Cora must go where no officer has returned from: the Pact's hidden inner sanctum. To outplay a mastermind who knows her every weakness, she may have to cross a line she can never come back from.
Success means stopping the slaughter. Failure means becoming their greatest work of art.