To Visit the Queen — Diane Duane

The sorcerous felines who guard the Gates between worlds are back. In a wondrous sequel to the bestselling The Book of Night with Moon, acclaimed author Diane Duane presents a fabulous adventure that will forever change the way you look at cats ...

THE CATS WHO LOOK UPON THE QUEEN

The wizards of Grand Central Station--pampered Rhiow, alley torn Urruah, and the kitten Arhu--are summoned to London, where an ancient Gate has turned into a timeslide, dragging innocents to or from other eras. For the evil Lone One is warping time, manipulating an alternate universe to unleash nuclear horror across the dimensions.

Rhiow's team has to stop Armageddon. Aided by a human child named Arthur Conan Doyle, the wizards must save the life of Queen Victoria--every Queen Victoria, in every universe--then find the forgotten magic to rewrite history before the time warps reach the present. Or the cats who can save Creation will have never existed...