The Valley of Fear

"The Valley of Fear" is the fourth and final Sherlock Holmes novel by Sir Arthur Conan Doyle. It is loosely based on the real-life exploits of the Molly Maguires and Pinkerton agent James McParland.

But your more deadly proposition is not so clear. Let us for a moment consider
the difficulties which stand in the way. "We will suppose that thiscouple are united
by the bonds of a guilty love, and thatthey have determined to get rid of the man
who stands between them. Itis a largesupposition; for discreet inquiry among
servants and others has failed tocorroborate itin anyway. On the contrary, there
isa good dealof evidencethat the Douglases were very attachedto each other." "
That, I am ...