Tara and Seb investigate what caused the fire, only to discover clues that suggest Aunt Bridget may have been murdered by poison

Cast: Naomi Sequeira, Margaret Cabourn-Smith, Finney Cassidy, Georgie Farmer, Dan Fredenburgh, Georgia Lock, Jordan Loughran, Sharon Morgan, Clive Rowe, George Sear, Alex Starke, Belinda Stewart-Wilson