Nightwing (Nightwing Vol. 4 #111)

WHAT'S WRONG WITH NIGHTWING?! Something's very wrong with Nightwing and it's starting to catch up to him. Can the world's greatest detective help him figure out what's going on before it's too late? Plus: The Plague has left 14th Century Europe in chaos, as a young man known only as the Son of Gray hunts the man who killed his father. A story of revenge, told in two parts.