David Grimes

For eons, Earth has been under observation by the Firstborn, beings almost as old as the universe itself. The Firstborn are unknown to humankind - until they act. In an instant, Earth is carved up and reassembled like a huge jigsaw puzzle. Suddenly the planet and every living thing on it no longer exist in a single timeline.

Robert A. Heinlein wrote The Number of the Beast, which was published in 1980. In the book Zeb, Deety, Hilda, and Jake are ambushed by the alien "Black Hats" and barely escape with their lives on a specially configured vehicle (the Gay Deceiver) which can travel along various planes of existence, allowing them to visit parallel universes. However, unknown to most fans, Heinlein had already written a "parallel" novel about the four characters and parallel universes in 1977.

Far out in the Pacific, among the sunny islands of Hawaii, a dark, venomous plot is engineered by a rogue agent, an angel-faced man called the Monk, who has a special fondness for high explosives. His target is an American troopship with 3,000 US soldiers scheduled to blow sky high - unless Matt Helm can stop him. But first Helm has to trust the beautiful stranger who claims to be his sister-in-law and insists that his former "wife" had just willed him half a million dollars.