Tandy drew the inside sketches for the first 26 volumes of the series as well as painting the covers of the first 26 volumes with the exception of volume 11 – the cover artist for volume 11 is unknown. Tandy read each text before he began sketching, so his early covers were closely connected to specific scenes in the plots. He also hand-painted the cover lettering and designed the original Nancy Drew logo: a silhouette of Nancy bending slightly and looking at the ground through a magnifying glass.