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When local police find something weird - spectres scaring commuters on a particular part of the Metropolitan Line, for example - they call for PC Peter Grant of the Special Assessment Unit, also known as The Folly. Stray river gods, missing Victorian children, fleeting 18th century dispatch riders, they are all in a day's (or a night's) work for The Folly team, even if the team only has two official members and the filing system dates back 2 centuries.

He may spend time pursuing supernatural offenders, but Constable Grant is a nicely wry and recognisable copper; health and safety rules annoy him and he is inclined to trust his hunches and park outside Chinese take-aways in the hope of a free meal.