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George has ambitious plans to build a railway line between New York, Chicago and Los Angeles, but his plans are met with resistance; Bertha is busy preparing for the Duke's arrival.

Amid their domestic quibbles, Agnes and Ada welcome the Scotts into their home; Bertha and George disagree about Gladys's future.

George negotiates with the Duke.

Bertha deals with unwanted rumors in the press and the surprise arrival of her sister Monica.

Gladys adjusts to her changed circumstances; Larry runs into a familiar face; Peggy gets an opportunity from an old colleague.

Marian has doubts.

Mrs Astor discusses the future of her Newport ball with Bertha; Larry receives disturbing news; Mrs Kirkland gets information about Peggy.

Bertha finalizes the guest list for the ball and faces the consequences; Dr. Kirkland makes a decision.

Detective Mare Sheehan revives an unsolved missing person's case amid increased community pressure; Mare attends a celebration for her legendary high school basketball win and connects with Richard, a professor who's new in town.

Mare visits a grisly murder scene before informing the victim's enraged father; as a video from the night of the crime surfaces, Mare questions suspects in the case and gives an icy welcome to county Detective Colin Zabel, called in to assist.

As Mare and Colin parse new physical evidence, phone records lead to an unlikely suspect; after lashing out at Helen about a possible custody fight over Drew, Mare receives some unprompted advice from Richard on how to move forward with Carrie.

With Mare forced to take a backseat on the case, Colin presses a local priest about the vague circumstances that prompted his transfer to the parish; an anonymous call gives Dawn hope that Katie might still be alive.

In her mandated therapy, Mare opens up about her family's history with mental health; Lori tries to get to the bottom of her son's outburst at school; Mare meets with a semi-retired source to help find a possible connection to her three cases.

Small-town Pennsylvania detective Mare Sheehan investigates a murder as life crumbles around her.

When her case takes a devastating turn, Mare's family and friends process the fallout while she attempts to find her own way forward.

Two rival London law firms take on the case of the century; in a world of love, scandal, betrayal and ambition, winning is everything.

Plant workers and firefighters put their lives on the line to control a catastrophic April 1986 explosion at a Soviet nuclear power plant.

With untold millions at risk, nuclear physicist Ulana Khomyuk makes a desperate attempt to reach Valery Legasov, a leading Soviet nuclear physicist, and warn him about the threat of a second explosion that could devastate the continent.

Lyudmilla Ignatenko, a Pripyat resident, ignores warnings about her firefighter husband's contamination; Valery Legasov lays out a decontamination plan, complete with human risks.

Valery Legasov and Soviet Deputy Prime Minister Boris Shcherbina consider using lunar rovers to remove radioactive debris; Ulana Khomyuk faces government hurdles in determining the truth about the cause of the explosion.

Valery Legasov, Boris Shcherbina and Ulana Khomyuk risk their lives and reputations to expose the truth about Chernobyl.

Comedian Dennis Miller joins Al Michaels and Dan Fouts as a commentator on ABC's "Monday Night Football" in 2000.