Very much in line with the film, Return to Oz, a personal favorite of mine.

Rife with weird objets d’art and dramatic situations void of any real danger. The underground fortress and faint-hearted exploration were reminiscent of Narnia, which is to say I was entertained and sometimes absorbed. It boils down to a rather simple but effective fantasy story, magical enough, if regarded through the uncircumspect eyes of childhood. I may continue through this infinitely nostalgic series, zipping through the audiobooks. The world effectively resides in my psyche now, so that I might visit Oz in my spare moments, only slightly distracted by the haphazard nature of this creative paradise.