Adventure of the Abbey Grange, The The. Sir Arthur Conan Doyle

In “The Adventure of the Abbey Grange”, Holmes and Watson are asked to assist on a home invasion and murder case. A woman reports that a gang of men broke into her home, killed her husband, tied her up, and stole the family silver. Though it seems like a clear-cut case of robbery gone wrong, Holmes's gut tells him otherwise. But what motive lies behind this erstwhile victim’s story?