It?s Damian Wayne?s birthday, and the Bat-Family throws him a surprise party in the Batcave! But it seems someone has other plans, as a pair of ancient Hittite deities crash the party! Robin?s battle with Tarhun and Arinitti takes him on a wild ride all the way to Budapest, ultimately leading him to his grandfather, Ra?s al Ghul. As Batman wages a battle to rescue his son, Damian is left to ponder a life-altering question: choose immortality and stand at his grandfather?s side, or choose mortality and continue on his path alongside his father.