Is it true that Arthur Conan Doyle helped to solve real-life crime cases?

Inevitably, as the creator of Sherlock Holmes, Conan Doyle was inundated with requests to solve mysteries, often of a criminal nature.

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Although he seldom liaised with Scotland Yard, where his often dismissive portrayal of professional detective work was not admired, he was a member of Our Society (or Crimes Club), a group of professional men who met to discuss criminal cases. In April 1905 he joined them on a tour of Whitechapel sites associated with Jack the Ripper.

On two occasions he ventured forth to help solve criminal cases involving notably marginal figures - George Edalji, a Midlands solicitor accused of animal mutilation, and Oscar Slater, a Jewish conman wrongly convicted of murder in Glasgow.