The Singing Towers

"Just give me one day... One day needing to save the planet." - The Doctor

Synopsis
Setting the randomizer to 'somewhere in the 5th millennia AD', The Doctor falls into the last place he expected to be, River Songs back garden... or close enough to it anyway. After insisting a trip in the TARDIS, River takes everyone to Singing Towers of Derilium. Is this a chance to finally enjoy a nice evil-free time? The man with the big book has other ideas...