This fictional story features real life authoress Agatha Christie caught up in another murder mystery. She, and a man she has hired as a driver/bodyguard, are in a London hotel where she is to sell the rights to her latest 'Poirot' story to a wealthy Chinese businessman. When the air raid siren is heard a police woman ushers them, and other guests into the building's cellar. Tensions rise when Agatha realises that somebody has stolen the manuscript of her new novel... that is the least of their worries though; soon a fight leaves one man dead and then another man dies... Agatha suspects foul play. If she is right one of the people in the cellar is a killer and nobody is being allowed to leave till the all clear sounds.
This, the third of Channel Five's films imagining Agatha Christie in a murder case, has a somewhat theatrical feel due to the limited locations. This isn't a problem as having a confined location gave the story a good sense of claustrophobia. The people stuck in the cellar were nicely varied, giving us an interesting group of suspects/potential victims. While it is mostly a drama there are humorous moments; I particularly liked difference between what the Chinese man said, in subtitles, and what his translator said he said. The cast does a solid job, notably Helen Baxendale, who has taken over the role of Agatha Christie. The resolution contained some decent twists and turns so only a few are likely to work everything out before the reveal but most are likely to work out some details. Overall a solid murder mystery that fans of the genre are likely to enjoy.