In the official trailer for The Diplomat season two, Keri Russells ambassador, Kate Wyler, investigates whos behind both the explosion at the end of season one that left her husband Hal (Rufus Sewell) injured, as she is confronted with the consequences of her actions.

The preview for the Netflix drama, set to return on Oct. 31, picks up right where the series left off with a bombing in central London and Kate and the British foreign secretary (David Gyasi) trying to figure out what happened.

Though a teaser trailer for the season revealed that Hal survived the blast, hes shown in a hospital bed and visibly wounded as Kate asks him if he can hear her and he jokes, No. The trailer then connects the explosion with the investigation into the attack on the British warship that started the series, as the British prime minister (Rory Kinnear) declares in a meeting that Russia is responsible for both.

Theyve attacked us at sea and at home, he says.

But Kate, as viewers saw at the end of season one, already believes that the attack on the warship was initiated by the British government, with the prime minister himself possibly involved.

She details her call is coming from inside the house theory to the CIAs U.K. station chief (Ali Ahn), scribbling some of her suspicions on a hospital white board before they scramble to cover up their work when someone walks in the door.

Season two will see Kate investigating both attacks as she and Hal grapple with the future of their marriage after she planned to leave him amid a burgeoning attraction with Gyasis Austin Dennison.

The trailer sees Hal telling Kate she could still leave him and asking her if she had planned to sleep with Dennison, with her confessing that she was.

Heres the full season two synopsis from Netflix: A deadly explosion in the heart of London shatters U.S. Ambassador Kate Wylers world (Russell). Struggling to rebuild the lives that broke and the team that split apart, Kates worst fears unfold: The attack that brought her to the U.K. didnt come from a rival nation, it came from inside the British government. As Kate chases the truth, her only real ally is her almost-ex-husband Hal Wyler (Sewell), very much alive, and very much involved. She faces a fraught marriage, a complex dynamic with British Foreign Secretary Austin Dennison (Gyasi), and a threatening visit from Vice President Grace Penn (Allison Janney).

Later in the preview, Kate is shown facing some consequences for her actions as her colleague Stuart (Ato Essandoh) tells her she made a tactical error, and it was deadly as the two solemnly observe a coffin being loaded onto a plane.

Hal is also shown telling her something was the cost of doing business, which greatly upsets her.

Dont ever say those words to me again, she says.

Over a montage that includes scenes of conflict, the trailer also picks up the ongoing storyline of Kate being considered to be vice president of the United States.

Stuart is shown telling someone over the phone She is not a vice president, before viewers later hear him say, shes running with scissors right into my staff and me.

And then Kate and Hal meet Vice President Grace Penn (Janney), who Kate is being considered to replace due to a scandal involving Penn that viewers learned of in season one. Wondering if Penn knows about that back-channel plan, Hal quickly reasons that she does when he sees her face.

The Diplomat creator Debora Cahn previously teased the challenges in Kate investigating the U.K. in a Tudum interview. The U.S. and the U.K. dont spy on each other, Cahn said. In fact, they share all their intelligence. So how do you investigate the PM? Who do you trust?

As for the season-one-ending explosion, which appeared to hit Hal and some of Kates colleagues, Cahn previously said the politically motivated attack takes some lives and shatters the rest. The marriage she thought was over, the relationship she thought was beginning all of it, in pieces.

Cahn added that in season two, everything we thought we knew about the Wylers changes, as does everything they think they know about each other.

The Diplomat is executive produced by Russell, Cahn, Janice Williams, Peter Noah and Alex Graves.