Destinies converge in Japan after a barbarian ship washes ashore in a poor fishing village. Meanwhile, in Osaka, Lord Toranaga finds himself outplayed by his enemies.

Blackthorne and Mariko test their new alliance as they train Toranaga's gun regiment for war. Yabushige must navigate his past promises to Ishido when an old friend comes to the village.

Blackthorne and Mariko struggle to contain the secret that could get them both killed. Yabushige searches for the spy who has betrayed his intentions to Lord Toranaga.

Outplayed by new alliances in Osaka, Toranaga is forced to carve out a new deal with a long lost family member.

In the wake of a tragic death, Blackthorne finally considers the true nature of Toranaga's plan.