The BBC have released the official story synopsis for Dark Water, the eleventh episode and first part of the Series 8 finale, written by Steven Moffat.

In the mysterious world of the Nethersphere, plans have been drawn up.

Missy is about to come face to face with the Doctor, and an impossible choice is looming.

“Death is not an end” promises the sinister organisation known only as 3W – but, as the Doctor and Clara discover, you might wish it was.