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.
2017
2022
2025
1982
1938
1939
2023
2016
2000
1997
2002
1973
2005
2010
2021
2018
1967
2011
1984
