I used to Do Divorce Investigations. It was never like this.

DUGGAN: I'm washed up. I'm sent to Paris to find out if anything odd 

is happening in the art world and what happens? The Mona Lisa gets 

stolen under my nose. Odd, isn't in it.

ROMANA: I'm going to leave a note for The Doctor. 

I really think we should go and get it back, don't you?

DUGGAN: Yeah, but which one? I've seen seven. 

What am I going to see today, half a dozen Eiffel Towers lying about?

ROMANA: The real Mona Lisa. The original.

DUGGAN: Well, how do you account for the others?

ROMANA: Well, perhaps you're right. 

Perhaps Scarlioni has discovered a way to travel in time. 

Yes, perhaps he went back in time, had a chat to Leonardo, 

got him to rustle up another six, came forward in time, stole 

the one in the Louvre, and now sells all seven at enormous profit. 

Sound reasonable?

DUGGAN: I used to do Divorce Investigations. It was never like this.