Over a late-summer weekend in the 1950s, four boys set out to find a dead body rumored to be in the woods. Based on Stephen King’s novella “The Body,” Rob Reiner’s third feature upends the classic coming-of-age film by compressing time, and adding elements of the road-trip movie as the buddies (played by Wil Wheaton, River Phoenix, Corey Feldman, and Jerry O’Connell) go from boys to men literally overnight.