Detective Comics Vol. 1 (1937-2011; 2016-) #1110

Plot

INNOCENT GIRL… OR DEADLY ASSASSIN? Black Canary thinks she has granted shelter to a lost, scared little girl. But Batman and Green Arrow know the truth. Dinah has unknowingly taken in a trained assassin. As the Dark Knight and the Emerald Archer race to warn Black Canary, the question isn't who the girl is but rather, can they get to Dinah before it's too late?