It’s Delta’s sixteenth birthday. She gets a coming-of-age present, but it comes with a condition- she has to find her soul mate and prove she’s worthy of him in a week, or she will lose her adult tail it and it will stay pale. Delta meets various mermen from Mr Slob to Mr Useless, and sees their faults are hers. Then she meets Jonty, and realises she wants to be a better mermaid. More
Delta is a self-centred mermaid. Always thinking of herself and not of others, especially her parents.
Then when she reaches her 16th birthday, she finally gets her adult tail, but it is only pale green not emerald. She is handed a present but it comes with one condition. She has to find her soulmate and prove she’s worthy of him within a week, or it will stay pale and she will lose it. Not wanting to lose the tail she’s yearned for, Delta is determined to keep it, no matter what.
On her journey to find her soulmate, she encounters Zane, the vain merman, who is even more vain than she is; Evan the slobbish merman, who leaves his home a mess and expects her to clean it for him; a flash merman much like Zane, then Finlay the useless merman, who can’t keep up hard work as much as she can. In turn, the faults she sees in them, she sees in herself and starts to rectify her behaviour.
Delta is now upset and desperate, as her tail has begun to disappear. Not wanting to fail ‘The Quest’ Delta discovers that the answer is closer to home than she thought. She meets Jonty, the merman –next-door. Watching him, she realises how self-centred she has been, and when she has to help him, that attitude is tested. Delta discovers her true self, and finds love and her soulmate, and gets to keep her tail, which glows emerald.