We continue with the adventure, with Captain Una trapped in the other dimension attempting to rescue her friends.
Meanwhile, the Romulans have the key and are making a menace of themselves with it by disrupting peace talks between the Klingon Empire and the Federation.
With David Mack writing the story you know there well be mayhem. There is lots of action to occupy the story culminating in a spectacular battle between the Enterprise and a Romulan Bird of Prey.
The story mostly is dedicated to the recovery of the key and solving the mystery of its power. There was some interesting tension on the Romulan vessel that I enjoyed a lot.
The book teed up the next and final instalment in the series nicely and I started listening to it right away.