A sinister school where graduation means death . . .
A monstrous mystery lurking below a quiet London street . . .
A desperate plea for help delivered by . . . hang on. A potted plant?
The Doctor has been summoned. The galaxy is in terrible danger, and only a Time Lord can save it. But to do so, she must break in to an ancient vault on a remote and frozen world – from which nobody has ever returned alive . . .
Can the Doctor and her friends Yaz, Ryan and Graham uncover the shocking secret in Vault 13?
