Four undergraduates of the female-only Persephone College, Oxford University, meet on the roof of the boathouse one cold January day to form the Lode League. Its purpose of cursing the hated Bursar of their college, Miss Denning, becomes a bit awkward when the League spot her drowned body drifting downstream in her canoe. The League decides to protect their friends from any accusations by investigating. Death on the Cherwell was another of my holiday reads. I hadn't intended to get it, but Blackwell's Bookshop…