His hatred of Anstruther now became a mania, an insensate resolve to mortally stab this meddler who always stood in his path.
Robert hoped that his present ordeal was over.

It had only begun.

He was called on to answer questions without number.

Why had the tunnel been made?
What was the mystery of the Valley of Death?
How did he manage to guess the dimensions of the sun-dial?
How came he to acquire such an amazing stock of out-of-the-way knowledge of the edible properties of roots and trees?
How?
Why?
Where?
When?
They never would be satisfied, for not even the British navypoking its nose into the recesses of the world--often comes across such an amazing story as the adventures of this couple on Rainbow Island.
He readily explained the creation of quarry and cave by telling them of the vein of antimony embedded in the rock near the fault.

Antimony is one of the substances that covers a multitude of doubts.