Alone with Reginald “Reggie” Davis after Seamus Callahan disperses the others, Anna insists she is being framed, much like her father once was. She connects the methods of each murder to circumstances that implicate her: Judd Dodge was poisoned after naming her motives; Edith Gerhardt was suffocated but staged to mimic Anna’s earlier outburst with a cord; and Herb Pulaski’s throat was slit after everyone learned Anna had a knife. Reggie challenges her theory that Jack Lapsford is behind everything by questioning whether Lapsford could physically escape Herb’s locked room via the window and exterior of the train.

Anna senses Reggie suspects her and presses him. He admits others believe she is the killer and proposes she stay confined to avoid a mutiny. Anna, uneasy because the killer can traverse the train exterior, reconsiders the sequence of deaths: Judd died publicly, unlike Edith and Herb, which feels inconsistent with a framing strategy.

Reggie asks whether Judd’s role was worse than others’, and Anna agrees Judd was deeply culpable for designing the explosive locomotive. Reggie probes if Dante Wentworth could have poisoned the martinis; Anna recounts the lounge scene in detail, noting Dante mixed all four drinks in one shaker and invited the group to choose freely. She recalls the order of selection and that no one approached Judd closely after he took his glass.

Replaying the moment, Anna eliminates the possibility of a surreptitious dose after pouring and realizes a critical omission: she never saw Judd drink from his glass. Given the visible gritty residue later identified as rat poison, she concludes Judd could not have been poisoned by sipping and therefore may have faked his death.

Anna bolts for Judd’s room, with Reggie and Seamus following. On the way, Reggie questions Seamus’s ability to properly check a pulse; Seamus admits he did not know the proper technique, further supporting the possibility of a staged death. They enter Judd’s room quietly, expecting a corpse, but find only an empty bed and a discarded sheet. Judd Dodge is gone.