Barbara Gordon the secret super hero Batgirl has been invited to the biggest Halloween party of year. Unfortunately she already agreed to spend time with Robin her younger crime-fighting partner. Instead of arguing with her mentor Batman Barbara decides to bring Robin along. That night the teens arrive at the costume party hosted by a collector of Halloween artifacts. Suddenly all of the lights go out! When they turn on his prized artifact a black cat made of rare diamonds is missing! Now Batgirl and Robin must capture the feline felon who stole it. Just in time for Batman's 80th Anniversary this action-packed chapter book also features a brand new Batman's Friends and Foes Roster and historical archives from the Caped Crusader's many years of fighting crime.