The answer is: Obadiah

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

Obadiah, often overlooked amidst the larger tomes of the Old Testament, packs a punch despite its petite size! Flashing with vibrant imagery and passionate prophetic warnings, this tiny book zeros in on the downfall of Edom—a nation neighboring ancient Israel. It's curious to note that Obadiah’s entire narrative flows from the historical context of the invasion by foreign powers, pointing to the consequences of betrayal and violence, particularly the Edomites’ betrayal of their kin during Israel's times of misfortune.

You might find it fun to know that, while Obadiah may be the shortest, it has some pretty powerful themes that ring true throughout the scriptures: justice, retribution, and the loyalty to one’s neighbor. In this case, the neighbors let each other down. A fascinating echo here is the Book of Amos, which addresses social injustices overtly contrasting the isolation in which Obadiah finds tangled its ethnic politics.

Additionally, the name "Obadiah" itself means "servant of Yahweh," conceivably highlighting a larger theme found within the Old Testament—the call to serve a bigger ethical ideal over national identity. So, while it may be short and tricky to find (go to your Old Testament and open it to find a page sparkling with roughly 21 verses!), it serves as a poignant reminder: sometimes the smallest treasures hold the mightiest lessons!