Silverborn the Mystery of Morrigan Crow by Jessica Townsend

When Morrigan is invited into Nevermoor’s wealthy Silver District, she discovers a world of extravagance and a family mystery she’s eager to unravel. She could never imagine where it will lead: a white wedding, a golden dragon and a red pool of blood.
 
Embroiled in suspicion and danger, Morrigan leaps head first into a murder investigation, while also grappling with her ever-growing Wundersmith powers. And although her friends are there to help, she fears that could change if they learn she’s keeping a terrible secret of her own.
 
As shadowy forces awaken in Nevermoor, can Morrigan find a killer and solve the mystery in her own past … before the clock strikes midnight?