First broadcast 4th/5th November 2021.
Adam Dalgliesh is sent to a nursing school to investigate the death of Heather Pearce, a student poisoned during the demonstration.
Helen Aluko - Christine Dakers
Alice Nokes - Julia Pardoe
Eliot Salt - Madeleine Goodale
Robin Kristoffy - Shirley Burt
Alex Kristoffy - Maureen Burt
Beccy Henderson - Heather Pearce
Fenella Woolgar - Sister Mavis Gearing
Amanda Root - Sister Brumfett
Siobhán Cullen - Josephine Fallon
Richard Dillane - Dr. Stephen Courtney-Briggs
Bertie Carvel - DCI Adam Dalgliesh
Jeremy Irvine - DS Charles Masterson
Avin Shah - Rohan Chopra
Natasha Little - Matron Mary Taylor
Syd Ralph - Miss Collins
Lily Newmark - Morag Smith
Laura Hughes - Librarian
Brid Brennan - Mrs Louise Dettinger
