in the silmarillion , on the other hand , there is the element , devised much later , of the unconscious betrayal by hurin to morgoth 's spies of the general region in which gondolin must be sought , in 'the mountainous land between ( * this is in fact specifically denied in the silmarillion : 'she contrived it that the work was known but to few , and no whisper of it came to maeglin 's ears . '