Naomi Lorrimer

In the novel Third Girl, Naomi Lorrimer and her husband are friends of Ariadne Oliver. Ariadne was a houseguest of the Lorrimers. Near the beginning of the novel, they took her to a party at the Restaricks at Crosshedges. There Ariadne met most of the key characters in the plot, notably Norma Restarick. They got talking about detectives and Ariadne mentioned Hercule Poirot.

Later Naomi Lorrimer is instrumental in kick-starting the investigations of Ariadne Oliver and Poirot. She gives Ariadne the address of Norma as well. She also helps Poirot by arranging for him to visit Sir Roderick Horsefield at Crosshedges.