I have read through the issues included in this volume and thought they were really interesting. If you are familiar with the Court of Owls (introduced in DC's New 52 run) and enjoyed it, this would be a great read for you.
This volume continues the Ric arc, where after being shot in the head, Dick Grayson a.k.a. Nightwing lost all of his memories from when he was adopted by Bruce Wayne as well as his time as Robin and Nightwing. Over the course of the eight issues (including the second annual) in The Gray Son Legacy, we see the return of Talon, William Cobb (who also happens to be Dick's great grandfather), as he tries to bring him into the fold. To become the Talon he was originally supposed to be before Dick was taken in by Bruce Wayne. We get more details about why Dick's not remembering his past and not making any attempt to. This does have it's fair share of action and a pretty interesting story.
This is a graphic novel that is intended for adult audiences.