Raised by a vicious mercenary to become the perfect assassin, Cassandra Cain broke free from her evil upbringing and took on the identity of Batgirl, Gotham's female protector. A skilled fighter with uncanny reflexes, the teenaged Cassandra studied religiously under the tutelage of Batman and Barbara Gordon, the original Batgirl, in order to hone her abilities and deprogram her killing instinct. Now with newly developed skills, Batgirl is joined by Robin and the Spoiler as she takes on a mind-manipulating scientist, super-powered kidnappers, a group of cop-killing bank robbers, a sadistic child killer, and a government agent obsessed with revealing her true identity and origin.