Bad Monkeys by Matt Ruff

Bad Monkeys is a slightly confusing headtrip through the mind of a (possible) serial killer. Jane Charlotte, recently arrested for murder, is dealing with a court-appointed psychologist to discuss her crimes. She reveals she works for a secret agency, one of "Them", called the Bad Monkeys. They're a covert group who travel the world killing irredeemably evil people. They do this through the use of secret government technology that makes the killing look like a natural death.

The problems arise when Jane Charlotte discovers the Mandrills, a rival group bent on causing chaos. It becomes a race against time as Jane struggles to find her long lost brother and escape the clutches of the Mandrills.

Ruff begins the novel rather deftly, but by the middle of the novel has gone from stacking plot twists to dumping and dogpiling them. There are double-crosses, triple-crosses, double agents, fake double agents, fake towns, fake organizations that later turn out to be real before they're revealed to be part of a different fake organization, etc. The ending, while providing an interesting twist, didn't do much to clear up the chaos that preceded.