Set against the backdrop of the early 20th century and the creation of the Oxford English Dictionary, the story follows Esme, a young girl who grows up in the Scriptorium where her father works. As she collects discarded words that don't make it into the dictionary, Esme becomes aware of the biases and omissions in the language that reflect societal inequalities, particularly regarding women's experiences. Her journey of collecting these "lost words" becomes a quest for understanding and preserving the voices of those marginalized by history, highlighting the power of language in shaping our world.