What if to-morrow, and to-morrow, and to-morrow brings no light to unravel this mystery?
The whole affair is a terrible mystery; be assured I will do my best to unravel it.
What the police have failed to fathom, how can you hope to unravel?
She has that sort of head that loves a hard knot to unravel!
Of all the tangled webs ever I essayed to unravel, this is the knottiest.