Chapter One

      “I won!” Antonia Lee burst through the surface of the water, her arms triumphantly stretched above her head.

      “Well done, Flipper Feet,” clicked Bubbles, “but you only won because I gave you a head start.”

      “No you didn’t,” laughed Antonia.

      “Did,” clicked Bubbles, playfully splashing her with water.

      “Water fight,” shouted Cai, surfacing with Dream. “Girls against boys.”

      “You’re on,” clicked everyone.

      Dream swam over to Antonia, Cai joined Bubbles and soon the sea was foaming like a shaken bottle of shampoo as they splashed each other with water.

      “Truce!” panted Antonia at last.

      Treading water, she pushed her long blonde hair out of her eyes.

      “That was such fun!” clicked Bubbles happily. “I’m glad you’re back. We missed you loads, didn’t we, Dream?”

      Dream nodded fervently and clicked, “It wasn’t the same without you.”

      “We missed you too,” said Antonia.

      She and Cai had just returned from a trip to Australia to visit Cai’s parents, who worked over there. Cai was temporarily living in Sandy Bay with his Aunty Claudia, who ran a marine conservation charity called Sea Watch.

      “Let’s have another race,” said Bubbles.

      Antonia shook her head. “Sorry, Bubbles, but there isn’t time. We’ve swam much further than we normally do and I promised Mum I’d be home early. School starts again tomorrow and I’ve got to get my things ready.”

      “Don’t go to school,” said Bubbles. “Come and swim with us instead. We can show you lots of new things.”

      “I bet you can,” said Antonia. “But we still have to go to school.”

      “I’ll go and get the rubbish,” said Cai. He turned and swam towards a small beach nestling at the foot of the cliffs.

      “Wait for me.” Antonia swam quickly after him.

      Antonia and Cai had been litter picking. It was part of their role as Silver Dolphins to protect the seas and all the creatures living there. Whenever the Silver Dolphins were needed, Spirit called to them through the silver dolphin charms that Antonia and Cai always wore. A very special magic let them swim and communicate with their dolphin friends. Today Spirit had called them to clear some floating rubbish he’d found.

      When it was shallow enough Antonia and Cai stood on the seabed and waded up the beach.

      “It’s a shame there’s no bin on the beach. We’ll have to be careful how we get this back,” said Cai, picking up the strips of polystyrene packaging they’d found. “This stuff is lethal if an animal eats it.”

      “I know,” said Antonia gravely. “It breaks up into tiny balls that don’t rot and are left in the sea forever.”

      They shared the polystyrene between them, being careful not to snap it.

      “Where are we?” Antonia wondered aloud. She looked up at the cliffs. “There’s a lot of noise coming from up there.”

      “I think this is Crane Point,” Cai answered. “Aunty Claudia told me there’s a block of luxury apartments being built on the cliff top here. There was a story about it in the Sandy Bay newspaper. Lots of people don’t want the apartments to be built because they’ll spoil the view and bring more traffic to the area. Most of the apartments are being sold as holiday lets.”

      “I don’t blame them,” said Antonia hotly. “It’s lovely here.”

      “Aunty Claudia says it’s not all bad,” said Cai. “The building project has created lots of jobs and the tourists will too when they start visiting.”

      “True.” Antonia walked backwards down the beach, keeping her eyes on the top of the cliffs for signs of building activity. “But the builders should be more responsible. This looks like their rubbish. They should clear up properly and not dump things in the sea.”

      “Maybe it blew away,” said Cai reasonably.

      “That’s not clearing up properly,” Antonia argued, hoping this wasn’t going to be the start of a bigger problem.

      They swam back to Bubbles and his mum Star, who looked at the polystyrene inquisitively.

      “It seems harmless,” clicked Bubbles, “but Dad says it can kill us.”

      His sister Dream shivered. “Thanks for taking it away,” she clicked.

      Bubbles and Dream swam with the Silver Dolphins back to Claudia’s beach.

      “Goodbye,” clicked Bubbles. “And if you change your mind about going to school we can teach you lots of new things.”

      Antonia and Cai laughed.

      “See you soon.” Antonia rubbed noses with Bubbles and then Dream.

      As the dolphins swam back out to sea Antonia trod water for a moment, reluctant to go home. She’d had a brilliant summer and wasn’t keen to go to school the following day.

      “That’s it then, the summer’s over,” sighed Cai, echoing her gloomy thoughts.

      “It doesn’t feel like it,” said Antonia, slowly swimming towards the shore. “It’s still really hot. I don’t want to sit in a stuffy old classroom all day.”

      “Me neither,” agreed Cai. “Especially now we’re in Year Six. Mrs Howard said she’s going to work us extra hard.”

      They waded up the beach. The Silver Dolphin magic made the sea water pour off them like a mini waterfall until their clothes were completely dry. Antonia shook out her damp hair and Cai pulled a face as he ran his fingers through his.

      “The water makes my hair go extra curly,” he laughed.

      They sat on the warm sand to put on their sandals, then went through the gate that led to Claudia’s garden.

      Claudia was talking to a builder who was making a deepwater pool for injured sea animals. She waved and called out, “Are you staying to tea, Antonia?”

      “Not tonight, thanks,” said Antonia. “I promised I’d be home early.”

      “See you tomorrow then,” said Cai after they’d put their rubbish in the Sea Watch bin.

      “See you,” said Antonia.

      On the way home Antonia stopped halfway up Sandy Bay Road to look at the sea. A funny feeling was bothering her, and her thoughts strayed to the building site at Crane Point. Staring at the bright blue water, Antonia strongly sensed that Mrs Howard wasn’t the only one who would be keeping them busy that term.