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.
A humble businessman with a buried past seeks justice when his daughter is killed in an act of terrorism. A cat-and-mouse conflict ensues with a government official, whose past may hold clues to the killers' identities.