"That's what I shall have to find out," said Mr. Flinders. "I shall have to keep a watch on those two."
"You might make a few inquiries about them," Peter suggested. "Discover where they come from, and what Strange's occupation is."
"You don't need to tell me how to act, sir," said Mr. Flinders with dignity. "Now that I've got a line to follow I know my duty."
"There's just one other thing," Charles said slowly. "You'd probably better know about it."
"Certainly I had," said Mr. Flinders. "If you was to keep anything from me I couldn't act."
"I suspect," said Charles, "that whoever got into the Priory has some reason for wishing to frighten us out of it."
Mr. Flinders blinked at him. "What would they want to do that for?" he asked practically.
"That's what we thought you might find out," Charles said.
"If there's anything to find you may be sure I shall get on to it," Mr. Flinders assured him. "But you'll have to tell me some more."
"I'm going to. A few nights ago a picture fell downn at the top of the stairs, and when we went up to investigate my wife found the upper half of a human skull on the stairs. My brother-in-law and I then discovered a priest's hole in the panelling where the picture had hung, and in it a collection of human bones."