This page contains information regarding new Star Trek material, and thus may contain spoilers.
(written from a Production point of view)
A photo of this bookshelf appeared in the Twitter account of Star Trek: Enterprise producer Aaron Baiers. The title of this book, and other books on the shelf, are Original Series episode titles, and were described as "Easter eggs for all Trek lovers". 
However, the shelf as it appeared on screen counted fewer books, and since the titles were not obviously readable, it is unclear which were removed and which remained.
This book's title refers to the episode "The Mark of Gideon". In-universe the title might not necessarily refer to the planet Gideon, as there are a a number of things with that name in Earth culture.