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.
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![[MADO]](https://image.tmdb.org/t/p/w500//kWo2TPGjE7ypdBidtUghpxVFsV2.jpg)
