This is another re-released British Library Crime Classic.  Death on the Cherwell involves a group of young women, students at an Oxford Women’s College, who have formed a secret “club” or group, mainly it seems for the purpose of complaining about the college bursar, Miss Denning.  The girls find the bursar dead, at first apparently drowned, but very quickly found to be murdered.  They join in investigating the murder with Detective Inspector Wythe.  The story ebbs and flows, there are parts that are very good, particularly after the niece arrives and some of the conversational pieces are excellent.  Fans of college based mysteries will in particular enjoy this.  I liked it but not as much as the John Bude books, also released as part of this set by the British Library.