Books that broke the internet: when novels go viral

In the past, a book’s success was measured in reviews, literary awards, and maybe, if the stars aligned, a TV adaptation. 

Now, a novel might become a global sensation because someone sobbed over it on TikTok, annotated every page with pastel highlighters, or declared it "life-changing" in an Instagram caption. From Fourth Wing to The Song of Achilles, some books seem almost genetically engineered to break the internet.