The Mystery of the Secret Room

Three friends — Ilya, Kira, and Sashka — unite as team "IKS" to investigate mysterious events. They learn, make friends, argue, and reconcile… and also tackle cases that send shivers down teachers' spines!
During renovations in the western wing of the... boarding school, workers find something unusual: a secret passage to a hidden room. The kids from team "IKS" can't wait to discover what the ancient walls are hiding, so they decide to start their investigation. Is there really an alchemical laboratory there? Meanwhile, the workers who found the room have something sinister in mind, but Ilya, Kira, and Sashka are on guard.
The stories take place in a unique setting — a boarding school located in a former merchant estate from the nineteenth century. The author of the series, Svetlana Krivoshlykova, masterfully describes the mysterious atmosphere of the old building and the secrets it holds. The combination of the spirit of a closed boarding school with the modern life of ordinary schoolchildren makes the reading engaging, and the unraveling of the mysteries memorable.