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.
2007
1946
2001
2006
1941
1999
2025
2002
1971
2017
1958
1960
1987
2004
1974
2023
2022
1992
1947
