The Mystery of the Missing Falls: The Kingswell Kid Detectives Series – Book 1 By Jen Weaver and Gayle Veitenheimer – The Children’s Book Review. Luka and Ember are ready to put their new detective agency on the map, and the town’s oldest unsolved mystery might be just the case to do it. When cousins Jake and Callie — who are at odds with each other — join the investigation, the young detectives set out to uncover the truth behind the missing falls, help mend an age-old family feud, and discover an unexpected tool along the way: prayer. Read about the book, guest post and enter giveaway.