Something Fishy

S1 E5: Lewis is busy testing the girls' powers, attempting to discover how they became mermaids. He warns them to stay on their toes if they want to keep their secret. Meanwhile, Cleo's younger sister, Kim, finds Cleo's diary, full of mysterious symbols and drawings of mermaids. Kim is totally intrigued and when she spots evidence of mermaidness, she comes close to finding out the girls' secret! But the girls put her off the scent, directing her attention to Miriam – and Kim's suspicions about mermaids are allayed when she mistakenly douses Miriam with a fire hose at the Queen of the Sea contest.