Steven Moffat is good with doctors. With The Empty Child, the Scottish scribe emerged as the not-so-secret weapon in Doctor Who’s regeneration. With Jekyll, he gives much-parodied source material fresh teeth. Stevenson’s novella is a tough gig: play it straight and you could look silly, play it silly and you could look pointless. Moffat’s modern-day reboot gets the tone right, turning hairy, hoary hokum into something daft but dark, lurid but lightly handled. Since we know the tale, he tosses you in at its middle, chops up the plot and layers twists. James Nesbitt gives good anchor as Dr Jackman and revels in Hyde’s leering excess.