The Jackson and Adin books aren't a strict series. In some stories they're secondary characters; in others, they're main characters. But their relationship does develop from one book to another. Here's the chronological order of the titles. The most important ones (or "core" stories) are 3, 4, and 5: 1. Plagued 2. Tormented 3. Obsessed 4. InDescent 5.…
