Very Scary Story (1987)

The grandfather of fifth-grader Gleb Borodaev was a famous detective writer, but he died before he could finish his last horror book. A novel based on a real story - the mysterious disappearance of man called Dachnik in Borodaev's country house. Gleb and his five classmates, including amateur detective Alik Detkin, decide to uncover this secret on their own.