In June, the Fifth Doctor (Peter Davison) finds himself back in history - not only that of Earth, but of his own with Vicki (Maureen O'Brien) and Steven (Peter Purves) - in Eddie Robson's Doctor Who - The Secret History:

The TARDIS brings the Doctor, Steven and Vicki to the Italian city of Ravenna in the year 540 – besieged by the army of the celebrated Byzantine general Belisarius. Caught up in the fighting, Steven ends up on a boat bound for Constantinople, the heart of the Roman Empire.

Rescuing Steven, however, is the least of the Doctor's problems – because he shouldn't be mixed up in this particular adventure at all. Someone has sabotaged his own personal timeline, putting him in the place of his First incarnation... but who, and why? The truth is about to be revealed – but at what cost to all of the Doctors, and to the whole future history of the planet Earth?

From today the trailer for Doctor Who - The Secret History can be heard on the story's page, along with more details and the opportunity to pre-order on either CD or Download.

The three "Locum Doctors" stories celebrating our 200th main range release - featuring the Doctor pitched into the lives of his earlier selves - start with Doctor Who - The Defectors, and continue with Doctor Who - Last of the Cybermen in May.

Subscriptions can be easily bought for the main range Doctor Who stories, not only offering a significant saving, but also making available downloadable PDF scripts, extended extras, and four newly-commissioned Doctor Who - Subscriber Short Trips stories a year.