The Job of The Wasp is the third novel I'd read by Colin Winnette. This most recent book, published by Soft Skull Press, is from the perspective of a boy who finds himself in an orphanage and then a swarm of murderous insanity. The boy is not exactly innocent, but parsing out his(?) culpability is half the fun.
The obvious comparison would be to Lord of The Flies. But with lots of dead bodies.
Get a copy direct from the publisher.