This book's most popular edition is in fact a completely different book from all the other editions. "Through the gate of the silver key" is a sequel to "The silver key". I tried to separate it but it won't let me because the most popular edition can't be separated.
The trick is to go to the all editions page, then click separate (on the right, near the top). Then you can use the "separate tool" to move all the other editions at once to a separate work. It's slightly different than trying to separate from the combine page. I already did this for you before realizing you might have wanted to try it yourself. Sorry!
This book's most popular edition is in fact a completely different book from all the other editions. "Through the gate of the silver key" is a sequel to "The silver key". I tried to separate it but it won't let me because the most popular edition can't be separated.