The Underground Library by Jennifer Ryan is a heartwarming and inspiring story of three young women who come together to save their beloved library during the Blitz.

Juliet, the new deputy librarian, is determined to breathe life back into the library, but she faces opposition from the men in charge. Katie is a young woman who is hiding a life-changing secret, and Sofie is a Jewish refugee who has escaped to the library to find friendship and help.

When the library is destroyed by bombs, Juliet relocates the books to the local Underground station, where she continues to lend out stories to keep spirits up. Despite the tragedies they face, Juliet, Kate, and Sofie are able to overcome their own troubles and save the library, which becomes a symbol of hope and resilience for the community.