Hearts, not guns, kill people.

Or at least that's the insight I gleaned from the trailer for The Dark Tower, a.k.a. "The Chronicles of N(a)R(ni)A"—now available on Blu-ray!—a coulda-shoulda-woulda summer blockbuster from Sony Pictures with a storyline that, strangely enough, resembles that of Last Action Hero, a high-profile bomb for the studio 24 years ago.