Who Killed Emerald Isacson?

This is the first of ten books in the Misbourne Murders series of cosy crime novels by award-winning, best-selling crime writer Denise Beddows.Having swapped the frenetic pace of London life for early retirement in Buckinghamshire's scenic Misbourne Valley, retired Security Service couple Carole Murray and Dave Lloyd find village life tranquil - perhaps a little too tranquil - until Carole joins the University of the 3rd Age local history group and learns of an unsolved historic murder. Drawing on the contacts of her ex-detective turned MI5 agent-handler husband, Carole and her new Third Ager friends determine to solve this twenty-five-year-old mystery and find out who killed the scientist Dr Emerald Isacson. Their discovery of two more suspicious deaths which occurred around the same time suggests there is a dark and toxic secret hidden deep within the heart of Chalfont St George. When Emerald's sister Euphemia is suddenly murdered in the same way as the previous three victims, and Carole and Dave's cottage is twice broken into, they realise they have put themselves in real danger. Is it time to seek expert help? Should they leave the sleuthing to the head of local CID, Detective Inspector Bernard Hogget, or should they set a trap for the killer?