The Dalek Trap by Nicholas Briggs
The thing about black holes is, they’re big and they’re black and they’re deadly, and you’d have to be mad to go anywhere near them. Because anything that falls inside a black hole ends up crushed in the singularity.

Unfortunately, the Doctor just went mad, or so it seems, and flew his TARDIS beyond a black hole’s event horizon, causing him and his companion Lucie Miller to end up marooned on a planetoid just inside the event horizon. Along with a Dalek saucer… and something else. Because this is no ordinary black hole…

This is the Cradle of the Darkness.

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