It was handy to know who they were in case there was an emergency, or an office party.

When he’d joined the Service he’d been in Psych Eval, which had involved evaluating operational strategies for psychological impact – on targets as well as agents – but had also meant carrying out individual assessments; who was stressed, who’d benefit from a change of routine, and who was a psychopath. Every organisation had a few, usually at management level, and it was handy to know who they were in case there was an emergency, or an office party.

― Mick Herron, London Rules