A story of sisterhood, secrets and standing up for what you believe in from the award-winning author of The Little Bee Charmer of Henrietta Street and The Weather Girls

It's 1956. When thirteen-year-old bookworm Rosy Heron and her big sister Martha are sent to Dublin to help their aunt Toto in her busy bookshop for the summer, their quiet lives change overnight.

The two sisters quickly become part of the Baggot Books team as junior booksellers and bicycle delivery girls. But the bookshop is also full of secrets. Where does their aunt disappear to at night, and what exactly is happening in the basement of the shop? Rosy is determined to solve the mystery, but she's not the only one interested in the goings-on in Baggot Books …