Subject/Tag - Jack and Gil (Fictitious characters)

Old Sleuth's Own (Ogilvie)

106. Jack and Gil; or, The Wonderful Adventures of Two Acrobats
108. A Remarkable Feat; or, Jack and Gil's Great Detective Work
110. Two Wonderful Detectives; or, Jack and Gil's Marvelous Skill
112. A Successful Shadow; or, Jack and Gil's Greatest Catch