We have read the previous three books in the Threshold Series (The Blue Door, The Hidden Deep, and The Broken Window). I have been reading the series with my 9 year old daughter. We have been enjoying the story of Prissie Pomeroy. Prissie is a teenager who is able to see and interact with angels. She becomes best friends with one, Koji, and has numerous other friends in her community that she discovers to be angels as well. In this book, we see the farewells of many dear friends but the blooming of beautiful relationships with others. The book focuses on Prissie's saying good bye to her friend Koji, as well as the further development of her friendship with the young man Ransom. The most interesting story line with in the book is the interactions with Adin, a fallen angel that has been tormenting Prissie for some time. I think I like the series because even though it is about angels, Kinde always points the characters and the readers back to God who is the only one worthy of de...