It is autumn in Bridgetown and Mack decides to take Ruby, Magnus and Suki on a lovely woodland walk. They walk through crunchy autumn leaves as they go. Mack notices Ruby is falling behind. She says she’s enjoying the sound of the crunchy leaves. Mack offers to record the sound on his phone, if she stomps through the leaves. Then, when they pass a babbling stream he records that sound for her too. Eventually, they all wander off the beaten track, looking for conkers. Mack admits they might be lost, and his phone has no signal so he can’t use the map app. Ruby hears the sound of the stream they passed before, and then they follow all the sound clues they heard, to find their way back. Ruby saves the day and Mack promises to bring a paper map the next time they go on a walk.