The picture above was made by me.
The covers for the third and fourth books in the upcoming Doctor Who: The Darksmith Legacy series have now been revealed and approved by BBC Books. Richard Dungworth is the author of the third book which is called The Colour of Darkness and Justin Richards is the author of fourth book which is titled The Depths of Despair. You can view the official synopses for both of these books below;

The Colour of Darkness
The Doctor travels to Karagula to meet the fabled Darksmiths in a bid to outwit the Agent and get the crystal. Can the Doctor uncover the mystery of the childless village? Who is the travelling Dreams-Merchant? Is there a link with the Dark Cathedral of the Darksmiths? Will the Agent arrive and identify the Doctor to the Darksmiths? Find out by reading the third exciting instalment of The Darksmith Legacy!

The Depths of Despair
The Doctor arrives in an underwater base on the planet Flydon Maxima - known locally as 'Despair' because hope is lost for all life there. The scientific base has for centuries been monitoring the results of planetary warming - the slow melting of the glaciers at the south pole and subsequent rise in sea levels. Curiously their most advanced monitoring equipment was created and donated by Varlos. The Doctor is helped by a little girl called Gisella. Why did Varlos risk coming here? What has caused the ice to crumble so rapidly now? Can the Doctor evade the rampaging Dreadbringers, and sort out the attacking sea monsters? Who is Gisella and will she and the Doctor manage to escape in the TARDIS? Don't miss this thrilling fourth instalment of the Darksmith Legacy...

The Colour of Darkness will be released on the twenty sixth of February whereas The Depths of Despair will be released on the twenty sixth of March. Both books will go on sale at an RRP of £4.99 and you can view more information about The Darksmith Legacy in general here and here in previous posts. You can also visit the official site for The Darksmith Legacy here.