In Britannia in 130, a young Roman officer named Marcus Flavius Aquila and his freed slave Esca search for the Ninth Legion's gold eagle standard, which vanished with the legion 13 years earlier.

Adapted from Rosemary Sutcliff's 1954 novel The Eagle Of The Ninth, the story charts the arrival of young centurion Marcus Aquila (Tatum) in Britain in 140 AD.