Prime Minister Garrity discovers the existence of a classified military program. Meanwhile, Harriet learns the truth of Mina's secret criminal activities.

The US Secretary of Defence arrives in the capital for an unscheduled visit. Garrity seeks a private meeting with drone pilot Cal Treloar.

A desperate Cal threatens Harriet, demanding a one-on-one meeting with Prime Minister Garrity.

The dogs of war are circling in the corridors of power, urging a reluctant PM to retaliate against Pakistan. Can Harriet stop the march to war in time?