Hellsing, seven years ago.

Integra: What’s going on, Walter? I’ve never had an overdue book in my life.

Walter: It isn’t a warning to you, sir. The British Library is requesting our help in retrieving a book from someone else.

Integra: Can’t their special ops branch handle just as much as we can?

Walter: Ordinarily, yes. But in this case, they suspect a monster is involved. Agents who have been sent to pick up the book return in one piece, but with no book and no memory.

This book is too valuable, and too dangerous, to take any chances. They’re sending in Agent Paper, and still they want backup. They want Alucard.