It's a day of painting shells for Megan and the gang, but when the paint runs dry, Shelby Seagull goes in search of fresh supplies. He returns with pots more paint for Larry Lobster and Willie Whelk to splodge and splat on bucket loads of shells. It's only later they discover that what Shelby found was no ordinary paint. Join the fun when Kelvin Crab discovers he has glow-in-the-dark paint on his hands in Shelby Seagull and The Painted Shells, the fourth book from the Whistle-on-Sea series.