4 ideas
Calcutta policeman Sam Wyndham, secretly addicted to opium, escapes a police raid on the den where he is smoking. He then stumbles on a murdered body he cannot report without exposing himself. His investigation turns up a string of killings tied to wartime chemical-weapons experiments that military intelligence is working to bury, set against the Prince of Wales's visit and Gandhi's non-cooperation protests.
An investigator who shares a hidden vice with the scene he is examining must suppress evidence to protect himself. His concealment shapes which truths he can pursue openly. Personal secrecy becomes a mechanism by which institutions end up missing crimes, because the people best placed to see them are the ones with reasons to look away.
An Indian officer serving the imperial police is required to suppress his own countrymen's peaceful political protest. The protesters see him as a collaborator, and his colonial superiors never fully trust him. His loyalty is tested from both sides at once, so any choice he makes costs him standing with one community.
When a state labels a program as military necessity, the people who expose its victims become the threat to be managed. The intelligence apparatus treats killing witnesses as a legitimate cost of secrecy. Ordinary criminal justice cannot reach crimes committed under the authority it serves.