This is the last of the Tenth Doctor era audiobooks that I've got to (though only the second produced), and it's good to finish on a high note. Catherine Tate is the narrator, beautifully carrying off Donna and also the Tennant Doctor, in a plot that beings rather like the later TV story The God Complex, with a bunch of characters from different places yanked together unexpectedly in one big building, but takes off in quite a different direction, both funny and serious, with some very neat ideas (the spamming AI at the beginning is just the start).
Dead Air is still my favourite Tenth Doctor audiobook, but this comes a close second.