Oliver is a footman at Thornleigh Abbey. He serves the Ashcroft family by relaying messages and transporting guests by carriage. These services were extended to  the protagonist during her acquaintance with the Ashcroft family.

Oliver has a polite and respectful demeanour, and appears to be trusted by the Ashcrofts. In the past, he has passed on messages of a sensitive nature to the protagonist. Ellie sent him to entreat the protagonist's assistance during a heated argument between Marcus and Richard Ashcroft.