The Camp of the Saints - Jean Raspail.

[Κασσάνδρα]

The story begins in Bombay, India, where the Dutch government has announced a policy that Indian babies will be adopted and raised in the Netherlands. The policy is reversed when the Dutch consulate is inundated with parents eager to give up their infant children as it would be one less mouth to feed. A Indian "wise man" then rallies the masses to make a mass exodus to live in Europe. Most of the story centers on the French Riviera, where almost no one remains except for the military and a few civilians, including a retired professor who has been watching the huge fleet of run down freighters approaching the French coast. The story alternates between the French reaction to the mass immigration and the attitude of the immigrants. They have no desire to assimilate into French culture but want the plentiful food and water that are in short supply their native India. Near the end of the story the mayor of New York City is made to share Gracie Mansion with three families from Harlem, the Queen of England must agree to have her son marry a Pakistani woman, and only one drunken Soviet soldier stands in the way of thousands of Chinese people as they swarm into Siberia.
Wikipedia

What was a work of fiction is becoming a work of prophesy.  Its a little hard to get these days, but can be found on Amazon.  Worth a read for sure.

[7] And when the thousand years are expired, Satan shall be loosed out of his prison,

[8] And shall go out to deceive the nations which are in the four quarters of the earth, Gog, and Magog, to gather them together to battle: the number of whom is as the sand of the sea.

[9] And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them.
Revelation 20

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I read it a long time ago, thought it was great.

Lent it to a friend, but she said it was rather depressing (on reflection, maybe she's right).

But, nonetheless, it's a great book - and well worth a read.