From the back:
"Somebody killed her", said the trembling man. "Who knows what devils walk on such a night?".
The missionary hut was a mile from the town, and when Sanders got there, he found nothing but a dead girl at the door. A devil had walked that night more potent than the creatures that come out of the water.
Sanders, the enigmatic but respected District Comissioner, and his assistants the efficient Hamilton and the irrepressible Lieutenant "Bones" have more jungle warfare on their hands. Around them the war drums beat and the lokalis wail in the "land of the big river". But this trio have their own special way of dealing with troublemakers.

I found it in München, probably not going to read it.

Enjoy!