Cassandra Cain returns to Gotham’s streets as Batgirl. Raised to be a perfect fighting machine, Cassandra has vowed to use her unrivaled combat skills to protect the citizens of Gotham. After defeating the feared assassin Lady Shiva in a harrowing battle, Cassandra must prove that she’s more than just an incredible fighter as she trains with Batman to become a detective. Batgirl’s detective skills are soon put to the test when she must help an amnestic secret agent recover his memory in time to stop a mysterious catastrophic event threatening Gotham City! Time is quickly running out and Cassandra must fight harder than ever before, using both her wit and strength to solve the mystery. Can Batgirl save Gotham before it’s too late? Collects BATGIRL #26-37 and a story from BATGIRL SECRET CASE FILES & ORIGINS #1.