Puffin move into June with a Sixth Doctor and Peri eShort story penned by Richelle Mead. From a quick look Richelle appears to be a prolific author almost single-handedly responsible for writing the (many) vampire stories aimed at teens that fill the bookshops (showing my age!) – her website gives a good guide. This story appears undead free:
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?