A genre-bending, strikingly original tour-de-force about an unlikely spy duo on the most dangerous and otherwordly mission of their lives, from the New York Times–bestselling author of H is for Hawk, Helen Macdonald, and the stunning new voice of Sin Blaché.

Adam Rubinstein and Sunil Rao have been nemeses and reluctant partners since their Uzbekistan days. Adam is a seemingly unflappable American Intelligence officer; Rao is ex-MI6, an addict and rudderless pleasure-hound with an uncanny ability to discern the truth about anything and anyone—except Adam.

Adam and Rao have gone their separate ways until they are called back together when a full-sized, 1950s American diner shows up in an English farmer's field and a mysterious death ensues. What follows is a reality-twisting, action-filled quest as the unlikely duo begin to uncover how and why people’s fondest memories are being manifested and weaponized against them, in increasingly bizarre and tangible forms, by a spooky, ever-shifting substance called Prophet. Adam and Rao must find a way to stop these malevolent entities from taking over a world that is just one perilous step from our own.

The brilliant minds of Helen Macdonald and Sin Blaché have created a tantalizing fusion of sci-fi, detective noir, action, and romance in this high-tension, fast-paced adventure. Prophet is a triumph of storytelling.