This charming mid-century children's novel, Susan in the Sixth, was written by Margaret Biggs and published in 1955 by Blackie & Son Limited. Biggs was a prolific British author known for her engaging "school stories" that captured the post-war boarding school experience, with this particular title being a sought-after entry in her popular Melling series. The story follows the protagonist, Susan, as she navigates the responsibilities and social dynamics of her final year in the sixth form, featuring illustrations by Ruth Murrell that exemplify the era's aesthetic. This hardcover copy is a stated first edition and presents in good vintage condition, featuring the original red cloth boards with crisp black lettering on the front and spine. The internal pages remain clean and well-preserved with a firm binding, though the paper shows some natural age-related toning, and the exterior boards exhibit minor bumping at the corners and light shelf wear consistent with its age.