During a mission to eradicate a vampire priest and his minions, Alucard is forced into a difficult decision upon encountering an injured police woman. Later Alucard encounters a mysterious warrior from the Vatican.

The Hellsing organization resorts to the recruitment of mercenaries in the wake of a devastating attack on headquarters, and Integra’s suspicions concerning the origins of their enemy are confirmed.

The Vatican’s formidable combat unit is mobilized in preparation for battle. Back in the heart of London, the Hellsing Mansion is attacked, and the Wild Geese represent the last line of defense against the undead.

When her memories are violated, Seras becomes trapped in an illusion which forces her to relive the most horrifying moments of her life. Upon waking from the nightmare, the real pain begins as the battle nears its end.