In a comedy based on Douglas Adams's novels, Stephen Mangan stars as detective Dirk Gently, whose investigative technique is based on "an unswerving belief in the fundamental interconnectedness of all things". Happily, the switchback script here, by Howard Overman (Misfits), has a kind of pointedly whimsical quality that's pure Adams. Although there are moments when Mangan's energy overwhelms the rest of the cast, you suspect Gently's creator would approve.

Fans of Douglas Adams were unimpressed with this reworking of his Dirk Gently's Holistic Detective Agency when it aired on BBC Four last year - they felt it deviated too far from Adams's original novel. Tonight, it gets its first terrestrial airing with the detective (Stephen Mangan) examining a case that links a missing cat with an exploding warehouse.

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I like comedies, I like dramas. Comedy-dramas I've never been sure about and Dirk Gently has all but convinced me they don't work. The eponymous hero is a detective who believes in "the fundamental interconnectedness of all things" but after this outing, even he'd struggle to make a case for that hyphen straddling the two genres.

Gently is the creation of Douglas Adams who was working on another of his cases when he died. This one began with a missing cat and ended with what seemed like the attempted murder of the three attractive leads, Stephen Mangan as Gently, Helen Baxendale and Darren Boyd, who was in the recent Whites with Alan Davies and seems to be cornering the market in sidekicks to curly-headed fools. They all survived but surely the show won't.

The soundtrack twanged with Randall & Hopkirk-esque harpsichord (or did that pair use a spinet?).

The hero chugged around in a Leyland Princess. But Dirk Gently lacked drama, despite blowing all of BBC4's special-effects budget for 2011 on a warehouse explosion, and it lacked comedy with not one halfway funny line - this only making me yearn for the return of Mangan's cFree Agents from last year and scour Amazon for a cheap box-set of Baxendale's Cardiac Arrest, deadly certain laughs of the darkest hue.

There was something satisfyingly leisurely about Dirk Gently, adapted from a Douglas Adams novel about an old lady's missing cat, and starring Stephen Mangan as the one-man "holistic detective agency" hired to find it. It wasn't the smoothest of narratives. I could never wholly applaud a plot that so late in the day relied on hypnosis and time travel (the only sci-fi trace element from the original story). And, although there was laughter and invention, I'm not sure that bumping into a closed door aspires to the heights of modern comedy, even when accompanied by the ditsy loose-limbed rhythms of 1950s jazz. But it had a pleasing, meandering pace to it. You had to admire the way that Dirk's investigative method - based on "the fundamental interconnectedness of all things" - made an unlikely virtue of stringing together unlikely coincidences. And Mangan did a fine job as the eponymous oddball loafer-genius, with his boffiny corkscrew hair, love of biscuits and the rapid eye movements of a man accustomed to making a quick buck and a quicker exit; Darren Boyd was good, too, as the bewildered but biddable sidekick Macduff. As the girlfriend, Helen Baxendale was as nice as ever. It wasn't Sherlock, but I wouldn't mind seeing what a series could do.

Dirk Gently, BBC4, Thursday

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