This chapter explores one of the most understudied actors across legislatures: their staff. Little research has been published on the roles and interpretations of staff on scrutiny in the House of Commons, despite their permanent and vital role to carrying out accountability functions. This chapter briefly places staff in their organisational context, which has undergone significant reforms since 2014–15. It then explores the ways in which staff interpret their role, which is characterised by three facets: first, being hidden, i.e., the belief that clerks should not have a public-facing role; second, unparalleled service, i.e., the belief that clerks are in the service of democracy and must support the institution of Parliament in every way possible; and third, passionate impartiality, the belief that all MPs must be served equally. These facets of their role throw up a number of tensions, which are explored in the final section of the chapter.