For everyone who automatically answers any question about the meaning of life with a number, this is great, silly fun.

The original cast of The Hitchhiker's Guide to the Galaxy radio show have reunited and are currently touring the UK live on stage.

Shada is unique among Doctor Who stories in existing in its own time-space bubble.

From the unique mind of Douglas Adams, the legendary 'lost' Doctor Who story Shada has been completed at last by Gareth Roberts and is available to buy now.

> Read our review.

To celebrate, we've got copies of the book to give away to three of our Twitter followers!

For a chance to win, just follow CultBox on Twitter and tweet the following text:

_{Follow @cultboxtv and RT for a chance to win #DoctorWho 'Shada' books http://bit.ly/GI8e3r #ShadaCB}

The Doctor's old friend and fellow Time Lord Professor Chronotis has retired to Cambridge University - where nobody will notice if he lives for centuries. But now he needs help from the Doctor, Romana and K-9. When he left Gallifrey he took with him a few little souvenirs - most of them are harmless. But one of them is extremely dangerous.

The Worshipful and Ancient Law of Gallifrey isn't a book for Time Tots. It is one of the Artefacts, dating from the dark days of Rassilon. It must not be allowed to fall into the wrong hands. And the sinister Skagra most definitely has the wrong hands. He wants the book. He wants to discover the truth behind Shada. And he wants the Doctor's mind...

> Buy the book on Amazon.

This competition has now closed. The winners are Natalie Henderson (@natz101) from Gravesend, Steve Field (@CaptFishy) from Cirencester and Martyn Havell (@Martyn_Havell) from Carshalton.

Terms & Conditions:
You must be resident in the UK to enter. Employees and contributors of CultBox.co.uk and their families are not eligible to enter. Only one entry per person is permitted. The judge's decision is final and no correspondence will be entered into. The prize may not be transferred to any other person. No cash alternative or alternative prize is available on entrant's request, but in the event of the advertised competition prize being unavailable we reserve the right to offer an alternative prize of equal or greater value. Entry in the competition implies acceptance of these rules.

In the final episode of the series, Dirk Gently tries to track down a murderer who’s bumping off the agency’s former clients while simultaneously trying to apprehend a stalker.

Like last week’s opening episode, it’s intelligently-plotted, well-acted and makes exceptional use of a small budget to end up looking extremely stylish.

At some point the show finds a rhythm that the pilot never had and bounces jauntily along with verve and – crucially – some much-needed laughs.

Based on the books by Douglas Adams, Dirk Gently returns to BBC Four next month for a new three-part series.

In anticipation of the imminent reappearance of Dirk Gently on BBC Four, we’re thumbing a lift around the galaxy of creator Douglas Adams’s finest characters.

The BBC have released a trailer for the new series of Dirk Gently, which returns to BBC Four next week.