In London, Hal's actions cause friction as Kate heads to Paris with Dennison to get a handle on the Lenkov situation, which soon takes a shocking turn.

After a sit-down with a Russian ambassador leads to new intel and mixed messages, Kate takes a trip to the Oval Office and reconnects with an old friend.

To appease Trowbridge, Kate seeks Hal's help with a high-profile visitor and consults an informed source in secret as complicated feelings begin to grow.

Tempers flare at Chevening House, where an unexpected guest's arrival sends Kate and Dennison scrambling for a resolution. Hal makes a new connection.

As Rayburn's rep takes a hit, Kate drops in on Dennison's private meeting at the UK Foreign Office and learns startling information about the attack.

At Winfield, President Rayburn's plans in the Gulf have the staff on edge as tensions between a determined Hal and a strong-willed Kate come to a head.

As new details about the bombing emerge, Kate struggles to see eye-to-eye with Hal. Prime Minister Trowbridge's fiery remarks at a funeral cause a stir.

After a hostile attack on a British vessel, seasoned diplomat Kate Wyler assumes a new role in the UK that puts her skills — and marriage — to the test.