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.
2019
2024
2014
1939
2007
2022
2015
2012
1968
1937
1984
2021
2023
1943
2020
1981
