Sentence:  The photographer had photographed, the doctor had certified life extinct, the pathologist had inspected the body "in situ" as a prelude to conducting his autopsy – all with an <WSD>expedition</WSD> quite contrary to the proper pace of things, merely in order to clear the way for the visiting "irregular", as the Deputy Assistant Commissioner (Crime and Ops) had liked to call him. 
Meaning of the word marked with <WSD> tags:  The quality of being expedite; speed, quickness.