The Locked Room - Grand Format

Ruth and Nelson are on the hunt for a murderer when Covid-19 rears its ugly head. But can they find the killer despite lockdown ? Ruth is in London clearing out her mother's belongings when she makes a surprising discovery : a photograph of her Norfolk cottage taken before Ruth lived there. Her mother always hated the cottage, so why does she have a picture of the place ? As she died three years ago, Ruth can't exactly ask her, and her father denies all knowledge of the picture.
The only clue is written on the back of the photo : Dawn, 1963. Ruth returns to Norfolk determined to solve the mystery. She is also involved with the excavation of a skeleton, probably a plague victim, found in Tombland. Then Covid-19 strikes. Ruth and her daughter Kate are locked down in their cottage, struggling to continue with work and lessons while feeling lonely and frustrated. Luckily, the house next door is rented by a nice woman called Zoe and they become friendly while standing on their doorsteps clapping for carers into the silence.
Nelson is on his own because Michelle is in Blackpool, but he has no time to be bored. He's investigating a series of suicides that look increasingly suspicious. Then, one evening, he finds himself drawn to Ruth's cottage where he sees her chatting to Zoe. Something about Ruth's new neighbour makes him feel uneasy. Before he can investigate further, events take a deadly turn.