Nere and her friends are back from Atlantea, along with (most of) Kuron's kids. Nere is still torn between Dai and Tobin and fights to control her feelings. The kids try to adjust to life back at Safety Harbor, but just when everything seems ok again, they get an unexpected- and dangerous- surprise from an old "friend." Meanwhile, the Neptune scientists decide that it's time to tell the rest of the world about the Project. How will the rest of the world react? Who is the mysterious friend? Who will Nere choose? Read to find out! All characters belong to Polly Holyoke with the exception of some that I made up :)

Nere Hanson and her dolphins dive into perilous new adventures as she confronts dangerous shark mutates and savage Wasp, Whitey and Sham deep in the Twilight Zone. Tobin, Dai and even Cam return as Nere and her friends fight to save our planet from climate change and the insane scientist who wants to stop them. Along the way, Nere must also decide if she's finally ready to risk her heart.