Detective Comics Annual (1988-) #11
“THE EIGHTH DEADLY SIN” part two. A lock without a key. A murder mystery whose solutions could lead to countless deaths. An answer in search of--the Question! Renee Montoya must help Batman save Robin from Amon, the Sixth Sinner, while keeping the fanatic killer from uncovering a 2,000-year-old religious secret. But is Azrael willing to risk Robin's life in order to see this secret revealed?