"I think that my house is fairly burglar-proof.

I have one window which may be used as an entrance, the centre one of the three of my laboratory.

I keep it so because, to tell the truth, I am somewhat of a night prowler myself, and when I treat myself to a ramble under the stars I like to slip in and out without ceremony.

It would, however, be a fortunate rogue who picked the only safe entrance out of a hundred, and even then he might find pitfalls.

Here is the constable, but you must not go, for Miss McIntyre has still something to see in my little place.