Denzil started and forced a smile.

“Why, yes, of course!”

“Then you know the lines—

‘There are more things in heaven and earth, Horatio,

Than are dreamt of in your philosophy?’

The Princess Ziska was one of those ‘things.’”

Denzil regarded him in wonderment.

“What do you mean?”

“Oh, of course, you will think me insane,” said the Doctor, resignedly. “People always take refuge in thinking that those who tell them uncomfortable truths are lunatics. You’ve heard me talk of ghosts?—ghosts that walk and move about us like human beings?—and they are generally very brilliant and clever impersonations of humanity, too—and that nevertheless are not human?”

Denzil assented.

“The Princess Ziska was a ghost!” concluded the Doctor, folding his arms very tightly across his chest and nodding defiantly.