Nicholas Renton

Oxford's last surviving all-female college is bidding farewell to one of its most prominent professors, and a leading light in the feminist movement-but not before Lewis and Hathaway are called in to investigate two murders that may be linked to the college and its decade-old secrets.

Dr. Hobson finds herself caught up in a decades-old vendetta when one of her university friends is murdered, and another young student is killed in the house Hobson and her friends shared years ago. Obviously unable to act as the pathologist in the case, Hobson instead finds herself and her remaining friends—Dr. Ellen Jacoby and playboy Alec Giles (Rupert Graves, Sherlock)—suspects, and Lewis is forced to subject her to questioning.

Mr. Preston's true identity is revealed, and Molly puts her reputation on the line to save Cynthia from him. The Squire meets his daughter-in-law and grandson due to an unexpected tragedy. Roger and Molly acknowledge their feelings for each other.

Events before and during the Easter Charity Ball cause Molly to suspect there is a history between Cynthia and Mr. Preston. Mrs. Gibson stops Roger from seeing Cynthia until she eavesdrops on a conversation between Dr. Gibson and Osborne.

As she comforts Mrs. Hamley, who is upset about Osborne's banishment from the house, Molly realizes the declining state of the frail woman's health. Molly anticipates the arrival of Cynthia, her new stepsister. Molly overhears Osborne's secret.

A protective Dr. Gibson sends Molly away from a pupil who has confessed his love for her. At the Hamley's - Molly's new residence - she falls for the eldest son, Osborne, and then trouble erupts. Molly learns of her father's plans to remarry.

Even though they're as different as night and day, Molly and her sophisticated new stepsister, Cynthia, become fast friends.