The Boscombe Valley Mystery

In The Boscombe Valley Mystery, Inspector Lestrade summons Holmes to a community in Herefordshire, where a local landowner has been murdered outdoors. The deceased's estranged son is strongly implicated. Holmes, employing his trusty magnifying glass quickly determines that a mysterious third man may be responsible for the crime, unraveling a thread involving a secret criminal past, thwarted love, and blackmail.

This is the fourth of the twelve stories in The Adventures of Sherlock Holmes and was first published in the Strand Magazine in 1891.