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.
| Actor | Role |
|---|---|
| EEmma KilaneTiril | Tiril |
| TThomas FarestveitOliver | Oliver |
 Eldar VåganBestefar | Bestefar |
 Pål Sverre HagenOnkel | Onkel |
 Øystein RøgerPresten | Presten |
 Finn SchauJosef Scott | Josef Scott |
| KKaisa Gurine AntonsenIda | Ida |
 Lise FjeldstadAnna | Anna |
 Jon EikemoGullsmed Holm | Gullsmed Holm |
 Ulrikke Hansen DøvigenBlomsterhandler | Blomsterhandler |
 Evy Kasseth RøstenSkuespiller | Skuespiller |
 Lasse MatbergProdusent | Produsent |