Win 4 sets of Doctor Who books

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Doctor Who is back on our screens this weekend, and to celebrate the return of TV's greatest Time Lord we have a Tardis-ful of BBC novels to give away, telling all new adventures of the Twelfth Doctor alongside new companion Bill Potts.

The Shining Man by Cavan Scott sees our heroes confronting an infestation of urban bogeymen while Diamond Dogs by Mike Tucker finds something deeply sinister occurring in a diamond mining facility on Saturn. Plague City by Jonathan Morris, meanwhile, hurls the Tardis back in time to 1645, to an Edinburgh in the grip of the deadliest plague in its history...

All three books are published in hardback on April 20, 2017 and we have four sets to be won, courtesy of BBC Books. To be in with a chance of winning, simply answer this brain-teaser: