The Silver Dream - Neil Gaiman - Bog

Joey Harker is a hero.After mastering the ability to walk between dimensions, Joey helped save the Altiverse from destruction. But InterWorld's peacekeeping mission is far from finished.When a stranger named Acacia does the impossible and follows Joey back to BaseTown, things get complicated. No one knows who she is or where she's from?or how she knows so much about InterWorld.Dangerous times lie ahead, and if Joey has any hope of saving InterWorld, the Altiverse, and the mission, he's going to have to rely on his wits?and, just possibly, on the mysterious Acacia Jones.