Kaisa Gurine Antonsen

Accidentally, three sibling children are left alone in a winter storm on the island of Spitsbergen. No-one on the main land, an ocean apart, knows where they are. It's a dramatic fight for survival. (imdb)

The detective agency no. 2 has a new case to solve. Strange holes in the ground have appeared during the night and ruin Oliver's bike. The child detectives Tiril and Oliver will have to be as smart as Sherlock Holmes to find it out.