You are invited to a magical mermaid wedding! A special bumper-length story about saving our seas. The Sea Keepers are special guests at a mermaid wedding in Atlantis. But when a pod of whales doesn't turn up to sing at the ceremony, the girls suspect evil Effluvia is causing trouble again. The pod of whales has been stranded in Sandcombe harbour, where Emily, Grace and Layla live. Can the Sea Keepers find a magic pearl to save the whales and make sure the wedding goes ahead?