Years ago, Batman and Robin defeated a famous terrorist nicknamed "Mama"... at least, they believed. Today, and in the absence of his mentor, Dick Grayson, now Agent 37 of Spyral, is led to bring together and lead Batman's multiple associates; Red Robin, Harper Row, Red Hood or Spoiler, in order to neutralize this threat once and for all. But Cassandra Cain's arrival is changing the situation...