Batgirl #20 : Forget-Me-Not, Part 1 of 3

MURDER. MYSTERY. BATGIRL! A murder in Gotham's streets leads Batgirl to a crime scene with no discernible clues—only the words "Forget-Me-Not." As the investigation unravels, Cassandra Cain discovers disturbing gaps in her own memory. With no leading suspect to fight and no answers on the streets, she must go inward to find the truth.