This is No. 41 in the Round the World Library and was likely published in mid 1926, previously published as No. 141 in Street & Ssmith's Bound to Win Library.
"Every reader, young and old, has heard of Jack Harkaway. His remarkable adventures in out-of-the-way corners of the globe are really classics, and every one should read them.
"Jack is a splendid, manly character, full of life and strength and curiosity. He has a number of very interesting companions - Professor Mole, for instance, who is very funny. He also has some very strange enemies, who are anything but funny.
"Get interested in Jack. It will pay you. "
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Price: 17.95 USD