Chapter 2 examines the use of cab and carriage journeys in two family novels that centre around the revelation of adultery. In his Notebooks, James describes his conception for The Golden Bowl in terms of a ‘rotary’ movement. A similar motion describes the sparring couples of What Maisie Knew, whose protagonists make up ‘a vicious circle’ and whose heroine is always ‘in rotation’. For both family groups, the private carriage reinforces structures of belonging and exclusion. Meanwhile the question of whether to extend the family circle employs the London cab ride, whose own contested ‘radius’ from Charing Cross prescribed the limits of what was socially as well as economically possible. This chapter draws on contemporary maps and fare books, as well as transcripts from divorce trials – which routinely summoned cab and carriage drivers as witnesses of adultery – to show how James construes the urban journey as a matter of costly and relational knowledge. It also relates the author’s treatment of his fictional Londoners to his own restrictive and circular ‘geometry’ for aesthetic relations, as outlined in his Preface to Roderick Hudson.