Nineveh by Henrietta Rose-Innes

There's an out-of-control swarm of insects hampering the completion of Nineveh, a luxury estate outside Cape Town. 

When Katya Grubbs, proprietor of Painless Pest Relocations, is called in, she discovers far more to exorcise than the mysterious infestation. Her own past returns to torment her in the form of her unruly father and the chaos he creates. 

With Nineveh crumbling around her, Katya is forced to question her own place in a rapidly changing world.