Blake Crouch, Recursion

As he did in Dark Matter, Blake Crouch explores the repercussions of cutting-edge science in his latest novel, Recursion. Helena Smith's research into memory retrieval is funded liberally by an eccentric billionaire who sometimes seems to know more than he should about her project. Turns out, he has ulterior motives, and her research has practical applications she's never dreamed of. Once her life's work is completed, there's another lifetime of work ahead of her as she tries to deal with the consequences of her creation. Along the way she teams up with Barry, a policeman, who unwittingly stumbles into the nightmare Helena's research has created. Recursion is a complex, mind-bending story that may even merit a second read. I liked it as much—or nearly as much—as Dark Matter, which is to say, quite a lot.