Doctor Who: The Forever Trap by Dan Abnett

When the TARDIS is invaded by a holographic marketing scam, the Doctor and Donna find themselves trapped on the Edifice, a purpose-built complex of luxury apartments in space. Their new environs leave much to be desired: millions of beings from across the Universe have been gathered to live side by side in similar apartments. Instead of creating neighbourly affection, it's led to terrible battles being waged in the corridors and on the stairwells.  

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