On Duty presents a methodical photographic study of police work through the lens of Arnold Odermatt, who documented his daily encounters during decades of service. The images reveal a visual narrative centered on official vehicles, accident scenes, and roadside interventions, capturing the nuances of law enforcement with restraint and clarity.

Odermatt’s work demonstrates a formal composition and an observational distance that lends the photographs a documentary authenticity while also inviting reflection on authority, order, and the human element within structured systems. The volume’s 336 pages provide an extensive overview of these themes, emphasizing the interplay between duty and environment across time.