The Brits do crime dramas very y well and Unforgotten is no exception. on. Under the grey skies of North London, the body of a young man is discovered in a derelict building. ng. His diary implicates four suspects: cts: a devoted husband and father, a successful entrepreneur, a middledleaged disability worker and a wheelchair-bound man crippled d by dementia. So who did it? Stars Nicola Walker (right).