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.
2014
1964
1987
2004
2007
1959
2006
2015
2023
2000
2008
2010
1940
1998
1969
2016
2024
2001
1986
