My teaser :

“Mr.David Hume “.
Reginald Brett, barrister -detective ,twisted around in his easy-chair to permit the light to fall clearly on the card handed to him by his man -servant.
“What does Mr.David Hume look like ,Smith?” he asked.
“A gentleman , sir”.

The Stowmarket Mystery by Luis Tracy pg4. btw this was published in 1904!

A belated Happy St.Patricks Day all ! The correct form is St.Paddy’s day .The irish is Padraig .