Grey and Charlie Carruthers were both young officers in different regiments. They fought together in Scotland. In the years following Hector's death, when Grey was trying to numb the pain with sex, they had a few brief encounters.
In spring of 1759, Grey receives a letter requesting his presence as Carruthers's character witness at a court-martial in Canada, due to Carruthers being charged with failure to suppress a mutiny. Grey arrives in Canada and finds Carruthers in ill health—he dies before the date for court-martial is set, and Grey burns his body and scatters his ashes.