Robert Downey Jr and Jude Law make an unlikely pairing in the latest incarnation of the detective and his sidekick, Dr Watson, but by gum it works. The sleuth investigates murders that seem to have been carried out by Lord Blackwood, a worshipper of the dark arts. The only problem being, the peer had been executed before the spree. The tale may not be from the pen of Arthur Conan Doyle, but is an enjoyable romp, rattling along at a cracking pace, and the look of Victorian London is sumptuous. Fans of the source material might cry foul, but this is a welcome – if slightly leftfield – addition to the Holmes canon, and, after a fallow decade, a return to form for Guy Ritchie.