Robert McCall, who serves an unflinching justice for the exploited and oppressed, embarks on a relentless, globe-trotting quest for vengeance when a long-time girl friend is murdered.
Autobots and Decepticons are at war, with humans on the sidelines. Optimus Prime is gone. The key to saving our future lies buried in the secrets of the past, in the hidden history of Transformers on Earth.
