We know nothing about him.

But two years have elapsed and he has never turned up, so that if he left the house secretly he must have gone into hiding and be hiding still.

Of course, he may have been the sort of lunatic who would behave in that manner or he may not.

We have no information as to his personal character.
"Then there is the complication of the scarab that was picked up in the grounds of his brother's house at Woodford.

That seems to show that he visited that house at some time.