Part II of a reading list for Cassandra Cain. This one chronicles the reintroduction of the character in 2015 to now and is really the easiest to get access to. Given the single issues are mostly cheap and the trades (or Omnibuses) are "mostly" constantly in print (as in at the time of this tweet).

Batman & Robin Eternal #1-8, #10-14 - #1 features the reintroduction of the character into the Batman Universe. #10-13 is her new origin, with one section not mentioned, but you can easily put the pieces together what it is (aka Cass killed Harper Row’s mother).