Ruth Ware's six favorite books about boarding schools

Ruth Ware is the author of In a Dark, Dark Wood, The Woman in Cabin 10, and The Lying Game. One of her six favorite books about boarding schools, as shared at The Week magazine:
Gaudy Night by Dorothy L. Sayers

Set in an Oxford women's college, this is an enormously satisfying read — not just because of its happy ending, but also because of Sayers' pitch-perfect evocation of the febrile