The book was overall enjoyable. There's quite a bit of action with an interesting premise.
One caveat is that the reappearance of three characters, Purdue, Sam, and Nina, working together, makes no sense given what happened in the second book in the series. If someone was working with a Nazi virus and ended up abandoning you in dire straits, would you work with them again?
Six months after almost dying on a collapsing oil rig in the North Sea, Jefferson contacts Sam to help him investigate missing high-profile clients while on a Vision Quest retreat in the Arizona desert,
Warning: this has a gruesome element in it.
Fave scenes: wanting to charge her laptop, spying into the tent, and fighting the drones.