In SFX 251 Steven Moffat says, “It’s like a heist movie done with Doctor Who. It’s got a cracking monster in it.”
From Radio Times: The
Bank of Karabraxos is the deadliest bank in the cosmos – only a fool or
genius would tempt to rob it. Fortunately, for The Doctor, he’s both.
With the help of a beautiful shape-shifter and cyber-augmented gamer,
The Doctor and Clara fight their way past the most dangerous security
system ever devised. But nothing even The Doctor has encountered can
prepare them for the
Teller: a creature of terrifying power that can detect guilt.