The rising and falling actions in a novel take place on either side of the climax. The rising action builds up to the major conflict in the book, while the falling action outlines the fallout that results from the climax, eventually resolving in the end of the story.
The rising action in this story is the realization of David's abilities and the fact that he and the other telepaths are both powerful and endangered. As they seek to hide their mutation, the plot escalates, approaching conflict more and more. Petra's arrival and marriage endangers them even more because of this possibility of him revealing their nature.
The falling action in the novel happens once the battle and chase is complete and the telepaths are trying to find safety. Michael chooses to pursue Rachel (who he loves) and stay with her while the others travel safely to Sealand (New Zealand).