“THE BUTTON” part one! The cataclysmic events of DC UNIVERSE: REBIRTH #1 continue here! The Dark Knight and The Fastest Man Alive, the two greatest detectives on any world, unite to explore the mystery behind a certain blood-stained smiley button embedded in the Batcave wall. What starts as a simple investigation turns deadly when the secrets of the button prove irresistible to an unwelcome third party—and it’s not who anyone suspects! It’s a mystery woven through time, and the ticking clock starts here! BATMAN #21, on sale 4/19! <a href="http://www.dccomics.com/comics/batman-2016/batman-21" target="_blank" rel="noopener"> <span> http://</span><wbr /><span ></span><span>www.dccomics.com</span><wbr /><span ></span><span>/comics/</span><wbr /><span ></span><span>batman-2016/</span><wbr /><span ></span>batman-21</a>