The "CWA Dagger in the Library" is an award presented by the Crime Writers' Association (CWA) in the United Kingdom. It recognizes the best crime fiction book published in the previous year that is particularly popular with readers. The award aims to celebrate authors whose works resonate with the public and encourage a love for crime literature. The award is part of the CWA Dagger series, which includes various categories for different types of crime writing. The "Dagger in the Library" specifically highlights the importance of reader engagement and the impact of a book on its audience, making it a unique honor in the literary community.