Mighty Jerusalem had fallen sometime after Ezekiel was taken into exile. Of priestly lineage, he was granted visions of behind the scenes on earth and in the heavens.
We see three themes, progressing from doom to destiny, from gore to glory. First there is the judgment upon God's people for their sin. Then there is an assurance that their enemies would be held responsible, being judged according to their part in God's plan.
Finally, though, Ezekiel gives a firsthand account of a vision of future Israel and Judah. The symbolism is heavy, but the message of mercy and grace is clear.