Mayor Goodway and her twin niece and nephew are out “bird listening” for the famous singing songbirds of Adventure Bay. But what they discover are nests with eggs and a whole bunch of missing mother songbirds! While Marshall and Skye are put in charge of keeping the eggs warm, Ryder and spy Chase go searching for the missing songbirds which leads them straight to Mayor Humdinger’s secret lair. Now they’ll have to sneak inside without him knowing and free the birds!