Most telling was the gastric surgery. Keyes was nothing if not a time-management master. If investigators thought about it, Keyes could easily go at least twelve hours without eating, as he seemed to have done on the nights he took Samantha and the Curriers. Here was something else—far less pressing but no less sinister—to consider: Had Keyes begun biohacking his own body in his quest to become the perfect serial killer? As Jeff Bell would come to say: “Anything’s possible with him.”