An Eighth Doctor novel
The Tardis travels through a wormhole in space and time that leaves it nearly dead in a Swedish forest in the present day The Doctor reasons one end of the wormhole originates from there -- but where does it lead to?
The time travelers discover a massive military presence in the area. The wormhole is a result of strange experiments in teleport -- but the other end of the time space tunnel is rooted in a bizarre land not even located in our dimension -- the Dominion.
And the Dominion itself isn't under threat from a shapeless, all-pervading blackness.