Joe Goldberg's your average, cantankerous New York rare books seller. He's also an accomplished serial killer.
When we meet him Joe's lonely and looking for love.
Kepnes' much-praised 2015 debut You introduced Joe - who's fast becoming the Girls generation's answer to Patrick Bateman - he's charming, sexy and, after a disastrous relationship (guess what happened) Joe's looking for love. Being a misogynistic psychopath his standards are high.
But when blonde, blue-eyed Amy walks into his store he thinks he's found True Love. She looks like a girl out of a Guns and Roses video, knows the value of a Richard Yates first edition, shares Joe's love of Roth's Portnoty's Complaint and isn't averse to a little fellatio in a Starbuck's bathroom.
Pretty soon they're "like a f***ing John Mayer song come to life" and road-tripping to Rhode Island. But Amy's not who she seems - and - after breaking his pyschopathic heart and stealing his Roth collection - Joe's in LA chasing her down.