Bitter Angels opens when a woman suffering from severe PTSD after being tortured as a prisoner of war is called back to active service to investigate the death of her mentor by a sort of interplanetary secret service called the Guardians. The story is set in a future where medical science has achieved human immortality, but access to it is heavily restricted. It is also possible to have an AI chip implanted in your brain that provides you with lifelong companion that only you can see and hear. It is a future where colony world populations exist as indentured slaves working to pay off debts for water and air that can never be paid off.
The plot of Bitter Angels involves a series of extremely byzantine plots and the main characters' attempts to unravel them while be continuously manipulated by the powers trying to keep their secrets. I cannot attempt to describe the plot without spoiling it, but suffice to say it is genuinely interesting and kept me guessing right up to the last chapters.