It's Megan's birthday, but Bertie Bucket and Sandy Spade don't have the right ingredients to make her a birthday cake. To everyone's excitement, Sandy suggests they make it from sand and so the gang sets about making the best birthday cake ever. But when they come to present it to Megan, they can't believe their eyes- someone else has started to eat it. Find out who in the second book from the Whistle-On-Sea series.