The Little Friend by Donna Tartt

Twelve-year-old Harriet is doing her best to grow up, which is not easy as her mother is permanently on medication, her father has silently moved to another city, and her serene sister rarely notices anything. All of them are still suffering from the shocking and mysterious death of her brother Robin twelve years earlier, and it seems to Harriet that the family may never recover. So, inspired by Captain Scott, Houdini, and Robert Louis Stevenson, she sets out with her only friend Hely to find Robin's murderer and punish him. But what starts out as a child's game soon becomes a dark and dangerous journey into the menacing underworld of a small Mississippi town.

Tigerman by Nick Harkaway

Sergeant Lester Ferris is a good man in need of a rest. He’s spent a lot of his life being shot at. He has no family, he’s nearly forty, burned out and about to be retired. The island of Mancreu is the perfect place for Lester to serve out his time – and the perfect place for shady business, too, hence the Black Fleet of illicit ships lurking in the bay: listening stations, money laundering operations, drug factories and deniable torture centres. None of which should be a problem, because Lester’s brief is to turn a blind eye. But Lester has made a friend: a brilliant, internet-addled street kid with a comic-book fixation who might, Lester hopes, become an adopted son. As Mancreu’s small society tumbles into violence, the boy needs Lester to be more than just an observer. He needs him to be a hero.

Brighton Rock by Graham Greene

A gang war is raging through the dark underworld of Brighton. Seventeen-year-old Pinkie, malign and ruthless, has killed a man. Believing he can escape retribution, he is unprepared for the courageous, life-embracing Ida Arnold. Greene's gripping thriller, exposes a world of loneliness and fear, of life lived on the 'dangerous edge of things'.