Itโs ok but not thrilling. Relies on people making extremely stupid decisions over simple things. As usual with BBC drama, every current bandwagon theme is thrown into the plot and what may have been a reasonable couple of hours has been drawn out over 6 or so. Itโs also very repetitive, episode 4 spent 30 minutes going over the events of the previous 3 episodes showing mostly the same scenes as in the original episode adding very little to the plot.