Jack London's Burning Daylight was his most popular novel during his lifetime and was published in 1910. London himself died in 1916. Under copyright law in most places in the world, a book goes out of copyright (meaning that it can then be made available freely online, among other things) seventy years after the death of the author. As such, Burning Daylight, like London's other works, is no longer protected by copyright. This is good news for us because it means we can find the work online, where it has been transcribed and uploaded by Project Gutenberg, among others. Project Gutenberg is an excellent resource if you are looking for an older work, as it has a vast library containing most classic works of fiction in English. Burning Daylight can be found here:
Of course, if you would like to read the book in a paper copy, it is also still in print and can be purchased from Amazon and many other online book retailers.