Grandude's Green Submarine

"As the Chillers explored, Lucy spotted a picture of Nandude, their adventurous grandmother. 'When will we see her again?' asked Bob. 'Perhaps we could go on an adventure to find her!' said Em ... Grandude and the Chillers are back! Jump aboard Grandude's magical green submarine and join the quest to find Nandude, following her musical trail around the world and deep beneath the sea. From the legendary Paul McCartney's unique imagination comes this action-packed, rip-roaring adventure. Packed full of strange surprises, playful Beatles references, and heart-warming family fun"--Publisher's description