Jimmy Lorrimer

In the novel Murder is Easy, Jimmy Lorrimer is a friend of Luke Fitzwilliam. Luke stayed with Jimmy in London after returning from the Mayang States. When Luke wanted to go to Wychwood under Ashe to investigate the deaths which Lavinia Pinkerton had told him about, Jimmy helped him by giving him a cover. Jimmy came from a large family of twelve siblings and had many cousins. One of them was Bridget Conway who was the secretary to Lord Whitfield who lived at Ashe Manor. Jimmy suggested that Luke could pose as Bridget's cousin. He could stay with Bridget and Lord Whitfield on the pretext of researching for a book on English folklore.

Murder is Easy (1982 film)
In the 1982 film adaptation, Jimmy Lorrimer is portrayed by Leigh Lawson. Here he is an Oxford academic. He welcomes Luke Williams to Britain and later drives him up to Wychwood under Ashe. In this adaptation, he is not the cousin of Bridget. Instead, Lord Easterfield knows him personally through his mother Lady Barbara. Jimmy talks his Lordship into allowing Luke to stay at the manor by mentioning that Luke is invited by Lady Barbara to the royal enclosure at Ascot and that perhaps Lord Whitfield might be interested in coming to the event as well.

Later, Jimmy arranges for Luke to use Oxford University's computer to calculate the likely murderer based on Luke's probability theories.