Thrillkiller (1996-1997) #1

Elseworlds: When bored heiress Barbara Gordon meets free-spirited circus daredevil Dick Grayson, sparks fly right from the start, leading to a scandalous romance and the reckless decision to become the costumed adventurers Batgirl and Robin on the rooftops of Gotham City! But mere mischief becomes serious business when Dick's family is murdered, and Batgirl and Robin set out to mete justice on the Graysons' killers. At the same time, Detective Bruce Wayne is on the job to take down the young thrill seekers and solve the mystery of the Grayson murders.