Doctor Who: Something Borrowed
"A wedding on the planet Koturia turns out to be a far more dangerous proposition than the Sixth Doctor and Peri ever expected. It marks the return of a formidable old foe whose genius matches the Doctor's. Can the Doctor outwit this villain, save Peri and stop the wedding in time?
American fantasy author Richelle Mead puts her own twist on the Doctor's amazing adventures through time and space."