Explore "The Closed Book" by William le Queux on Textopian. Read with annotations and highlights.
The bull _passant gules_ of the Borgias was certainly a significant sign, deep there in the bowels of the earth, so far from the scene of the Borgias' forgotten triumphs.
My two companions were beside me in an instant, and both agreed that the bull placed there was a signal to the person who gained the secret of The Closed Book -- an invitation to search at that spot.