After a prayer the Israelites set to building the temple. Tatnai, the governor, asks for their permits and the names of the crew, but he's powerless to actually stop them until he gets a decision back from king Darius, because that's how hierarchal societies work, yo. He asks Darius to look up their claims that they have permission from Cyrus.
Conveniently, Darius finds the decree by Cyrus and even the blueprints and orders Tatnai not only to let them build the temple, but to pay for it and food for the workers out of his treasury. He orders them to hang anyone who interferes.
Finally we're introduced to Ezra, the supposed writer of this book. He comes to Jerusalem bearing a letter from the king asking him to scope out the situation and hand over a bunch of gold, silver and