Nightwing (New 52) Vol 1 Traps and Trapezes

Haley's Circus, the big top where Dick once performed, makes a stop on its tour in Gotham City - bringing with it murder, mystery and superhuman evil. To uncover more clues as to why a mysterious assassin is targetting him, Nightwing joins the Haley's Circus tour in order to find more clues and protect those he loves. But as Dick becomes closer acquainted with the big top he grew up with, he discovers there's a much deeper, darker secret to be discovered.