Thank God he had common sense in this book!

This is the second installment of Collision Course.
The Doctor and the Master have to decide how to help out with this pesky Dark Lord, because, the Doctor, being himself, refuses to do nothing. Moody is at Hogwarts, but now the two Time Travellers don't know how to keep an eye on Barty Jr.

Disclaimer: J.K. Rowling, as much as I hate her, owns Harry Potter and it's copyrights and the BBC owns Doctor Who!