From the publisher's website:
If you seek to stem this tide of chaos at its source, follow my lead—I set out for the dreaded Abyss on the morrow. —Lord Amgar the Bold, Paladin of Bahamut
The planes have always been a place of great mystery and danger in the Dungeons & Dragons Roleplaying Game, and the new array of planes debuting in 4th Edition continue that grand tradition. Home to gods and devils, demons and genies, fey and titans, these strange dimensions offer unlimited adventure opportunities for Dungeon Masters and their players.
Manual of the Planes explores the many planes introduced in the 4th Edition Dungeon Master’s Guide. This useful travel guide also comes in handy for players seeking to battle demons, devils, elementals, and other iconic D&D monsters native to the planes.