Superman Unlimited #15

Battle of the Super Sons! As war brews in El Caldero, something strange is happening to the Kryptonite scattered across the planet — a riddle that can only be solved with the help of a certain Dark Detective. But can Batman crack the case before Jon Kent and Damian Wayne turn the Batcave into a war zone?

The pieces are falling into place: a new kingdom is on the verge of rising, and a devastating new threat may unite the Superboys, pooling their powers against a common enemy.