 Zachary repents his betrayal of Polly, and his heart is physically healed (at least in part) before they return to their own time.When they return Polly decides that she and Zachary shouldn't see each other any more.Polly's grandparents, Kate and Alex Murry, were first introduced in "A Wrinkle in Time", the first book in the Time Quintet, but were not initially given first names.