Apologies. We've corrected the art credits below. Escaping from Arkham Asylum isn’t easy, unless you have the right tools. Armed with a rusty nail, some marbles, a trick flower, and a crowbar, Harley Quinn makes a break for it. She’s done joking around in GOTHAM CITY SIRENS #20, by Peter Calloway and artists Andres Guinaldo, Lorenzo Ruggiero and Ramon Bachs, and now nothing is going to stand in her way. On sale February 23.