From the #1 bestselling author of Anna O comes a highly acclaimed psychological thriller featuring an expert in memory conditions who must uncover the truth about her grandmother’s past

Olivia Finn is a memory expert at Charing Cross Hospital in London. One night, she receives an urgent call from the police at the Hotel Lutetia on Paris’s famous Left Bank. Olivia’s French grandmother, Josephine Benoit, has appeared at the Lutetia in a distressed state claiming she once committed a murder in room seven of the hotel at the end of the Second World War.

Traveling to Paris, Olivia finds her grandmother displaying classic signs of dementia. But Josephine is adamant, and her detailed memories are so exact that it seems almost impossible she is imagining it. More disturbingly, hotel records show that a woman did die in room seven of the Lutetia in 1945 but the killer was never found. Could Josephine’s story really be true?

As people start dying in the present day, Olivia is plunged into a race against time to uncover the truth about Josephine and what really happened in room seven. Set among the glamorous streets of Paris, this addictive thriller looks at memory and asks: what if you suddenly remembered a dark secret from your past?