A water dragon, living incarnation of the Endless Sea, saves the life of a young whale. The moment brings back memories – or rather, echoes of familiar words, fleeting images, shadows of sensations that the dragon had long thought forgotten. If only she could remember what they meant.

The news are full of reports about the disappearance of some ancient gemstones and an invasion of exotic animals in Ninjago City. Could there be a mysterious mastermind scheming to threaten the peace between humans and dragons? As if this wasn't enough, Pixal and Zane go missing, and it becomes clear that something horrible must have happened to the two nindroids ...

Zane suffers from the after-effects of having been tethered to Unagami's portal. Pixal can't forget what Milton Dyer said to her. Fluff ensues – and a confession that has been long overdue.

It all starts with a detective game staged by Pixal and Zane: a relaxed night out for the ninja and great fun. Until it isn't anymore. The two nindroids get involved in a street fight, and the ninja set out to investigate who is behind the attacks. Zane never expected this case to lead to a serious disagreement with his girlfriend and to remind him of his own worst trauma ...