The Threshold Series by Christa Kinde [Zondervan] is a supernatural adventure involving angels, appropriate for tween/teen readers aged 11 and up.
Book 1: The Blue Door ♦ On an ordinary afternoon in late July, Prissie Pomeroy stumbles into an adventure on her way to the mailbox. Koji—a strange boy in shining clothes—claims to be an angel, and she’s stunned to learn that there are others living and working in her hometown. None of them can explain why she’s suddenly able to see the unseen, but with God, nothing is impossible. Koji and his teammates answer her questions, change her perceptions, and strengthen a faith she’ll soon need… for danger lurks in the darkness. IN STORES NOW: Amazon | Barnes & Noble | Zondervan
Book 2: The Hidden Deep ♦ Harvesttime is in full swing when Prissie Pomeroy learns that something terrible happened in her family’s orchard. With school back in session, the rift between Prissie and her friends widens while Ransom and his friends keep getting on her nerves. As Koji and Milo introduce Prissie to the rest of Jedrick’s Flight, she’s drawn increasingly deeper into their world and closer to its dangers. A kidnapped apprentice suffers. A chained door bodes ill. A tiny angel makes a big difference. A battle line is drawn. Everything Prissie thought she knew is about to change… again! IN STORES NOW: Amazon | Barnes & Noble | Zondervan
Book 3: The Broken Window ♦ Christmas is right around the corner, and Prissie’s gift list has expanded to include an entire Flight of angels. As she searches for the perfect presents for her friends, she learns that good ones can come in unexpected wrappings, great ones come at a high price, and the greatest gift of all is still free. RELEASES SEPTEMBER 24, 2013!
Rough and Tumble ♦ A companion story to the Threshold Series. In The Blue Door, Prissie Pomeroy gets the barest glimpse of an invisible realm where the Faithful are at war with the Fallen. With Rough and Tumble, the point of view tilts into the heavenlies, and the story is told from a very different perspective! God’s angels serve Him in various capacities—Messengers, Protectors, Observers, and of course, Guardians. Meet young Ethan, the newest angel the Hedge surrounding the Pomeroy family farm, as he is Sent to watch over Prissie’s little brother Zeke. More details here. UPDATES WEEKDAILY!
Angels All Around ♦ When she was seven years old, Prissie Pomeroy fell in love with the mailman. Angels and demons collide over West Edinton, a small town where not everyone is what they seem. In this companion story to the Threshold Series, a divine Messenger becomes one little girl’s prince, and a fledgling Guardian becomes their knight. Illustrated by Anna Earley. More details here. COMING IN APRIL 2013!
Copyright © 2012 – 2013 Christa Kinde
Author Bio | Book One: The Blue Door | Book Two: The Hidden Deep | Rough and Tumble | Angels All Around | Story Art | Threshold Series Media Page
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Would you like a little something in your mailbox? Christa Kinde has postcards, and they could have your name on them! 
IN STORES NOW!
