These books are two of Robert Zelazny's lesser-known works, "To Die In Italbar" and "A Dark Travelling." "Travelling" is a sort of YA novella, a little frothier than usual Zelazny books, and "To Die" is a deeper, darker, more horrifying story.
"To Die In Italbar" brings us to a future where one man, Heidal (known as H), is given strange, mysterious powers -- he can be afflicted and then cured of any disease, no matter how hideous or incurable. (Thanks to a disease/healing goddess who visits him in his dreams) When he accidently infects and is attacked by the people of Italbar, he becomes a walking plague machine. Malacar, the one man still living on Earth with his telepathic alien translator, wants to find Heidel with the help of a vengeance-loving girl from a brothel. But Heidal is becoming more and more dangerous with the goddess's help...
"A Dark Travelling" has a family that makes yours look downright normal. Jim is a teen werewolf. His sister is a witch. His brother is an assassin who lives in a castle. His father travels dimensions, or "bands." But one night his father mysteriously vanishes, and Jim goes on a desperate, magical search for him. And it leads him to sorcerers and rebels on one of the "darkbands," where his father has been taken captive for a shocking reason.
These books aren't the most prominent ones that Zelazny wrote, but they're enjoyable reads. "Dark Travelling" has a sort of frothier edge to it -- the plot almost never stops going until the end, with a small cast of characters (several of whom remain a bit underdeveloped) and no philosophical musings. "Italbar," on the other hand, is much deeper and darker, with a lot of dream conversations and telepathic linking. A lot more action is going on inside the characters' heads.
On a quality front, these ibook reprints have good smooth paper and good bindings. Teens as well as adults will probably enjoy these -- there is a tiny amount of ...content in "Italbar" (Jackara works at a brothel) but nothing major. Fans of Robert Zelazny and thoughtful SF/F should definitely check these books out.