Batman and Robin: Eternal #16 (2016)

The Dying Joke
Grayson, Red Hood, Red Robin, and Harper Row have uncovered the full scope of Mother's dangerous operation, and they're ready to spring their trap! But there's one problem: Cassandra Cain has gone rogue, and they may not be able to pull her back from the edge! There's no time to lose, either, because for every mystery they solve about Mother, there are more waiting to be discovered, including Mother's next target, a place that couldn't be more personal to Dick Grayson!
Release Date: 2016