Luminary graduates from Oxford’s last surviving all-female college are on campus to honor beloved professor Diana Ellerby (Juliet Stevenson, Place of Execution). There is the confident lingerie CEO, the provocative newspaper columnist — and then there’s the passive aggressive Poppy Toynton. Poppy never quite blossomed intellectually like her peers. When Poppy is found dead on the stairs, her seething rage against her fellow graduates exposed, Lewis and Hathaway step into the esteemed circle of women to investigate.