Samuel Rotherstein

In the novel One, Two, Buckle My Shoe, Samuel Rotherstein is one of the directors of the Arnholt-Rotherstein banking conglomerate headed by Alistair Blunt. Given his surname, he is likely to be a relative of Blunt's late wife, Rebecca Arnholt whose mother was the heiress of the wealthy European Rotherstein family.

After a board meeting, Rotherstein noticed that Blunt was not quite himself and had been rather irritable. He wondered if Blunt's liver might be giving him trouble, as his own liver gave him trouble from time to time. Blunt explained that he had an appointment with his dentist.

Portrayals
In ITV's 1992 adaptation of the novel, this character is renamed Lionel Arnholt. He now comes from the American side of Rebecca Arnholt's family--her father was head of the American banking house of Arnholt. Jane Olivera is Rebecca's sister and Blunts sister-in-law. Lionel Arnholt refers to her as "Aunt Jane". In this adaptation, Arnholt plays the same role and learns that Blunt has an appointment with his dentist. Arnholt is also the one who recommended the dentist Henry Morley to Blunt. Arnholt has an additional scene in the episode where he is interviewed by Poirot and he gives him some background information about the Blunt family--how Blunt came to be married to Rebecca, and what Jane Olivera thought about that.

Lionel Arnholt is portrayed by Tom Durham.