Doctor Who: Grand Theft Cosmos (2.5)

'Here's to crime, Doctor!'

The Doctor and Lucie visit nineteenth-century Sweden and become embroiled in an attempt to steal the infamous Black Diamond of Claudia Tardelli. But they are not the only would-be thieves attempting the heist of the century; the Headhunter is back and this time she's brought a friend!

The Stone, however, is guarded by forces not of this world...