Invading Nairobi: "Heat of the Sun" fiction

"Valentine. Come to arrest me again?"
--Tyburn, "Hide in Plain Sight"

London, 1932. Someone is killing street children, and Scotland Yard Detective Albert Tyburn is sent to figure out who. Finding the killer is easy, but when the man turns out to be powerful and well-protected, incapable of being brought to trial, Tyburn gets justice his own way - by shooting the man in a London alley.

The options are simple: prison, or a transfer to Nairobi, Kenya, to head up the new Criminal Investigations unit. Tyburn chooses exile, and that's where things cease to be simple. Police Commissioner Ronald Burkitt despises him; the insolent colonists resent anyone who doesn't treat them like gods; and his best constable has an unfortunate tendency to spout Shakespeare at random.

And he's only been in the country an hour.