Ostensibly about drone tactics and the people who pilot them, this novel quickly turns on the moral question and challenge of shooting at long range at blurry targets involving split-second decisions on whether targets are tactical or “collateral damage.” It also asks the questions anyone might ask: how often does the Army fess up to decisions that were wrong, in which civilians got blown away by mistake. In this case, we are confronted with a talented female pilot, Jessica, who is removed from her job because she knows the truth about the Yarisi shoot in which she followed orders and destroyed innocent lives. The Air Force, for which she works, does not want information about the mistake to get out and they effectively remove her from her position and make sure she tells nobody about it. Unfortunately, she has already written about it to her father, a convict, and prison officials have flagged her letter as a danger to national security. In the meantime, on the other side of the plot, a young Wall Street “quant” named Ethan has developed an algorithm that enable his firm to capitalize on instability caused by drone strikes by instantaneously manipulating the stock market prices of key weapons and systems affected by strikes. His algorithm appears to have caused a mistaken manipulation that costs his firm millions and he finds himself as out as Jessica. Childress uses Jessica’s imprisoned father, Don, as a sort of moral amanuensis—because he’s a felon he cannot correspond directly with Jessica and because he’s a felon she should not have told him about the Yarisi shoot but they manage to keep in touch through a system of blind drops and coded addresses and to inform us readers what’s going on. It’s a clever device that most likely would not work in the real world, but she’s so earnest that we want it to succeed. So we have two systems, one algorithmic, one tactical, based on computers making decisions in which the computers are manipulated so that their decisions are questionable. And we have the very real problem of drone pilots making fatal decisions. One wonders how far we are from disaster in both worlds. This is, hesitation about the convict father’s role aside, a compelling summer read. It won’t make you like Wall Street or the Killer Forces that manipulate the drones any better, but you will have a decent read.