The Girl Below by Bianca Zander

Suki Piper is a stranger in her hometown...

After ten years in New Zealand, Suki returns to London, to a city that won't let her in. However, a chance visit with Peggy—an old family friend who still lives in the building where she grew up—convinces Suki that there is a way to reconnect with the life she left behind a decade earlier. But the more involved she becomes with Peggy's dysfunctional family, including Peggy's wayward sixteen-year-old grandson, the more Suki finds herself mysteriously slipping back in time—to the night of a party her parents threw in their garden more than twenty years ago, when something happened in an old, long-unused air-raid shelter. . . .

A breathtaking whirlwind of mystery, transgression, and self-discovery, Bianca Zander's The Girl Below is a haunting tale of secrets, human frailty, and dark memory that heralds the arrival of an extraordinary new literary talent.