The dark past of a seemingly perfect couple is gradually revealed in this observant debut of obsession and control

Glimpse them chatting in a restaurant or posing on Instagram, and you might think they have it all. The pair live in London but often travel, drawing the eyes of other guests, their skin glowing, their limbs artfully at ease. She writes affirmations on hotel stationery; he claims to taste notes of bark and tobacco in his chianti. As Sean Gilbert’s dark, observant debut opens in Istanbul, this apparently perfect couple bicker and sweat, for secrets lurk behind their facade – and one of them might be murder.

An unexpected reunion gets their sightseeing off to a shaky start. The unnamed narrator and his wife, Elle, have not seen Benny for 15 years when they cross paths outside the Hagia Sophia. An irksome university acquaintance who has become a second-rate rapper, Benny has the grip of a limpet. As the trio browse stalls and pull on saliva-slicked shishas, talk turns to the past.