A high concept story is one with a clear, easily-communicable premise. It typically involves a premise that is easy to pitch and driven by a straightforward plot. This is in contrast to low concept stories, which tend to be more character-driven with less of an obvious narrative hook. (Source: MasterClass.com)

Please consider carefully whether the book(s) you're about to add can be considered high-concept. Research the term further if you're unsure.