It is a truth universally acknowledged, that a single man in possession of a good fortune, must be in want of a wife. And then the dragons arrived.

The boy with fair hair lowered himself down the last few feet of rock and began to pick his way towards the lagoon. And then the dragons arrived. - Lord of the Flies, William Golding

How to begin? mused Robinton, the Masterharper of Pern. And then the dragons arrived. (Dragonquest, Anne McCaffrey)

In the light of the moon a little egg lay on a leaf.  And then the very hungry dragons arrived.

In the beginning God created the heavens and the earth. And then the dragons arrived.

There once was a boy named Milo who didn't know what to do with himself—not just sometimes, but always. And then the dragons arrived.

No one would have believed in the last years of the nineteenth century that this world was being watched keenly and closely by intelligences greater than man’s and yet as mortal as his own; that as men busied themselves about their various concerns they were scrutinised and studied, perhaps almost as narrowly as a man with a microscope might scrutinise the transient creatures that swarm and multiply in a drop of water. And then the dragons arrived. War of the Worlds

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Raak - is that something like "The Toll Booth"? Who was the author?