“Recursion” adds a thriller’s pace and many wormholes worth of complexity to all those time travel novels you’ve enjoyed since the Heinlein and Asimov era. A policeman investigates something dubbed the False Memory Syndrome while we watch a neuroscientist, funded by a tycoon, build a technology to store the depths of memories. By the time they meet, the plot spirals into mind-bending time trips that had me gasping with admiration. Crouch is a dab stylist and the hijinks are laced with recurring and building love stories that achieve genuine traction. A winner in both conception and execution.