Adriaan rings the doorbell at the house, but are not at home in Wales
Bassie en Adriaan: De Geheimzinnige opdracht
Bassie & Adriaan arrived at the address but they arrived an hour early. Meanwhile Adriaan rings the doorbell at a house, only there is no one at home and Bassie is standing against a telephone booth. Dan discovers they are an hour early and decides to check out the town of Caernarfon. An hour later they go back to the address. Adriaan rings the doorbell again at the house, but they are not at home again. The scene with Adrian at the house and him ringing the bell was shot on Castle Street in Caernarfon, Wales.