The answer is: Obadiah

Only containing one chapter, and notoriously difficult to find in a hurry!

Obadiah is indeed the shortest book in the Old Testament, packing a punch with its single chapter of prophecy. Written by a minor prophet, it may fly under the radar for many who are accustomed to the lengthier books of Isaiah or Jeremiah. This tiny text has its roots grounded in a backdrop of conflict; it's primarily a condemnation against Edom, which is situated southeast of Israel. Edom's treachery during Israel’s time of need—when they gloated over the misfortunes of the Israelites—sparks Obadiah’s strong words.

Speaking of brevity, Obadiah contains a note about the fate of both nations, reflecting the long-standing enmity between Israel and Edom. Fun fact: this book has been a profound finding for discussions on justice, as it makes a succinct call for the undermined to rise. If you dive into Obadiah, you might be surprised at how contemporary themes like betrayal and divine retribution echo throughout today’s world issues, sparking meaningful reflections.

Now, if you consider this literary curiosity, scholars have played with the text, noticing Obadiah's overall purpose also intertwines with larger themes seen in other prophetic works. Many readers agree that despite its leniency in length, every verse is potent—making it the Old Testament's dynamite bullet. So, never lose hope when searching—especially in an Old Testament where the “short, flop, and not often talked about” can still pack a historic and moral lesson!