Legion (Novel)

"Secrets and lies"

- Book's tag-line

Legion is the seventh book in the Horus Heresy series

Plot Summary
Legion features the Alpha Legion, the XX Astartes Legion (and last to be formed), which was known as the most secretive and inscrutable of all the Space Marine Legions.

It also features the Imperial Army, and a mysterious interspecies organization called The Cabal. The book describes the events that eventually lead to the decision of Alpharius Omegon, the Legion's Primarch, to support Horus.