Mysterious holes in the ground appear during the night, causing Oliver's bicycle to be destroyed. Who made these holes and why? The child detectives Tiril and Oliver will have to be as smart as Sherlock Holmes to find out.
2023
—
2025
1981
2018
1989
1977
2017
2015
2010
1991
1993
1976
1988
2008
1971
2009
1947
