When Batman captures the Joker and sends him to Arkham Asylum, he is introduced to the cryptic scientist known as Hugo Strange, who is also the new administrator.

Challenged by his overly ambitious goal to explore the human mind, Batman is trapped in the asylum and must face his most notorious advesaries while investigating the mystery behind a girl who has gone missing within its dreadful walls.

In this dark and gritty novella, Batman is put to the ultimate test, and must decide whether to protect his own identity or be the catalyst of another's.