Philo Gubb's Greatest Case

Mr. Gubb unfolded the paper and read the item under the headlines with
the most intense interest. Foul play meant the possibility of an
opportunity to put to use once more the precepts of the Course of Twelve
Lessons, and with them fresh in his mind Detective Gubb was eager to
undertake the solution of any mystery the Riverbank could furnish. This
was the article:--

'Just as we go to press we receive word through Policeman Michael O'Toole
that the well-known mussel-dredger and boatman, Samuel Flig...