Everyone loves secrets. You, dear reader, are probably already smiling in agreement. Eleven-year-old schoolgirl Lenka Leningradova, her friend Yashka and Lenka’s grandmother are also not going to argue with this statement. Trinity loves riddles. Natural curiosity and a desire to find answers to their questions lead them to two adventure stories told in this book. In the children's detective story “Lenka Leningradova and the Mystery of the Wooden Barn,” a team of amateur detectives follows the trail of the villains who cut down the Zorka apple tree, the favorite of Lenka’s family. At the very beginning, none of the friends realize that the investigation will lead them to much more intricate mysteries. The story “Lenka Leningradova and the Secret of the Watchdog” will tell what Lenka, grandmother and Yashka unearthed when, during the summer holidays, a wounded dog was found in a picturesque Altai village .The action takes place in the mid-nineties of the twentieth century: gadgets and the Internet are replaced by chases and surveillance in the fresh air. Fun reading!