By HILLEL ITALIE, AP National Writer NEW YORK (AP) — After gaining millions of young readers for her "Divergent" fantasy series, Veronica Roth decided she and her characters were ready for the next phase — a novel for adults. "I grew up on stories like 'Dune' and 'Harry Potter,' and 'Ender's Game' about people who shoulder burdens when they're too young to bear them," says Roth, who tells the story