So You're Investigating A Dead Body - That Moves. What Do You Do? And thus, the critical hook here. Shulkin combines his own military experience generally with his general medical knowledge as a working MD and spins a tale he openly admits (in the Author's Note) was designed to pay homage to some of the great comic book tales of old - and it absolutely works. The Nick Fury level spy story, the Purple Man horror of not being in complete control of your own body, in addition to the far more obvious Captain America and Hulk aspects here. Indeed, Shulkin takes nearly the entirety of the Marvel *comic* stories - where *oh so much* of the villains' actions revolved around some version of trying to recreate the Super Soldier program that turned Steve Rogers into Captain America - and manages to use that as inspiration for a plausible-enough real-world tale of how those things could actually play out.
Thus, for those looking for a fun action read with balls to the wall "total nonstop" action... this is going to be a ride you're going to love. For those needing a palate/ mind cleanse from the seriousness of whatever drama/ suspense/ thriller had your brain in a twist or from the latest bubblegum pop saccharine sweet romance (with perhaps some ghost pepper spice, if that is your thing)... this is going to give you exactly that. A fun few hours of engaging your brain just enough to follow along with all the twists here - and shutting it down enough to simply enjoy the ride. (At nearly 400 pages, this is on the longer side for many readers, though perhaps fantasy readers will enjoy the "speed read", since their books generally double that length. ;) )
Overall a fun read that does everything Shulkin set out to do and likely then some, this is absolutely one to check out almost no matter your normal preferences.
Very much recommended.