Detective Comics #734 1999

Detective Comics #734, published in July 1999, is "Mark of Cain, Part Two" and a key part of the "No Man's Land" event. Cassandra Cain prevents her father, David Cain, from killing James Gordon. She then independently confronts and defeats Two-Face, taking his coin. This issue features the first meetings between Batman and Cassandra Cain, and Two-Face and Cassandra Cain, exploring her unique communication through violence and setting the stage for her future role.