A real thief will break it in two minutes.

Burn me, I have to run into real thieves!

Surely you learned something during your stay which might help us identify the real thief.

But the police say the real thieves, though skilled, are probably far less refined.

Miss Dawson shows up at the hotel and is taken hostage by the real thief.

When he awakens, the girl shows up to tell him that she learned the identity of the real thief.

"But I won't be able to smoke out the real thief."

I think what happened is that she was set up by the real thieves.

I doubt that many real thieves have the sort of faith something like this requires.

We didn't even know if there were any, but the real thief must be one of them.