A dark traveling by Roger zelazny

Three teenagers with supernatural powers go on a mission to rescue their missing father, and uncover an interdimensional conflict. In less than 150 pages, Zelezny crafts an interesting universe, believable characters, a mystery, a mission, flashbacks that reveal the characters motivation, and a meaningful, climactic duel between good and evil. In other words, more than Suzanne Collins accomplished in it over 1000 pages. This is what happens when a grandmaster gears down to write a Y a title, and it fits in right on the same shelf as Le Guin's wizard of Earthsea, and Heinlein's citizen of the galaxy.