Then, again, another puzzle remained.

I remembered Louis' desire, almost command, that I should return to London by this particular train.

Had he any reason for it?
Was it connected in any way, I wondered, with the presence of this man and girl in the next compartment?
It seemed feasible, even if inexplicable.
I rose and strolled down the corridor, looking in at the _coupe_ where these two people sat, with all the banal impertinence of the curious traveller.

The girl met my eyes once and afterwards simply ignored me.

The man never looked up from his magazine.