Feline Wizards Series by Diane Duane

Wizards and sorcerers, some cats even can cast spells and become invisible. They are the guardians of the Gates, weaving and maintaining the magic threads between realities. But when an ancient evil conquers the mystical Gates beneath Grand Central Station, flooding New York with surreal horror from another dimension, a quartet of feline champions is called to defend Earth. These four small wizards must walk between worlds, cross the River of Fire, and hunt the Children of the Serpent... moreWizards and sorcerers, some cats even can cast spells and become invisible. They are the guardians of the Gates, weaving and maintaining the magic threads between realities. But when an ancient evil conquers the mystical Gates beneath Grand Central Station, flooding New York with surreal horror from another dimension, a quartet of feline champions is called to defend Earth. These four small wizards must walk between worlds, cross the River of Fire, and hunt the Children of the Serpent. And in an apocalyptic finale they will engage in ultimate battle against the Lone Power--a dark force that began untold eons before the creation of mere Man less

Traveling back in time to 1874 London to prevent an assassination plot against Queen Victoria, the feline wizards of Grand Central Station -- leader Rhiow and her able partners Urrah and Arhu -- must summon their powers to avert disaster in Victorian England, or else their archenemy, the evil Lone One, will warp time and trigger Armageddon... moreTraveling back in time to 1874 London to prevent an assassination plot against Queen Victoria, the feline wizards of Grand Central Station -- leader Rhiow and her able partners Urrah and Arhu -- must summon their powers to avert disaster in Victorian England, or else their archenemy, the evil Lone One, will warp time and trigger Armageddon. Teamed with a young Arthur Conan Doyle, Queen Victoria herself, and other historical figures, the feline wizards set out to find the forgotten magic that will rewrite history -- or the cats who can save mankind will never have existed. less