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.
2013
1998
1971
2022
1991
1974
1986
2020
1978
2026
1982
1989
2017
1943
2019
1988
2001
