Guido

In the novel At Bertram's Hotel, Guido was Elvira Blake's boyfriend when she was in Italy.

Elvira met Guido when she had been taken to the opera, and he spoke to her there. She saw him sometimes when she went to classes, and he used to pass her notes. She described him as "nice" and very attractive.

Elvira tells Bridget that she received a letter from Guido, where he signed his name as Ginevra, as if he was a girlfriend.

Elvira later tells Chief Inspector Davy that Guido used to threaten her, and they would have rows. Guido would bring some friends with him, and Elvira would pretend to like them better. Guido would get angry, and say that if she was not faithful to him, he would kill her. When Elvira received a box of chocolates which she believed to be poisoned, she thought that they were from Guido.