A celebrity couple on the wane are terrified when their baby is kidnapped. They demand MI5 investigate, but soon MI5 learns that there's more to this kidnap than first appears.
Pompey attacks an outnumbered Caesar. Vorenus and Pullo are stranded at sea. Atia continues to seek out Servilla's friendship in order to ensure her protection, while Octavia and Servilla's bond grows.
Holmes investigates when several busts of Napoleon are smashed for no apparent reason.