"If she's his confidential secretary, with access to his papers and business, she'd know all about the Princess transaction.

Now, of course, an inquiry or two of the usual sort would satisfy you about Fullaway--I mean as a business man.

An inquiry or two would tell you all about Delkin.

But you can't get to know all about Mrs.Marlow from any inquiry.

And you can't find out all about Fullaway from any inquiry.