Doctor Who Screenwriter Ben Aaronovitch's superbly entertaining supernatural crime series has, with its witty one-liners and wonderfully erudite take on London, won a legion of fans in double quick time. Peter Grant is learning magic fast. And it's just as well - he's already had run-ins with the deadly supernatural children of the Thames and a terrifying killer in Soho. Progression in the Police Force is less easy. Especially when you work in a department of two.