Sebastian is a civil engineering prodigy and his latest project is his most ambitious to date: to build a new city on the sheerest face of The Rock. His fiancee, Eva, a diver, is entranced by the penisula's hidden depths and concerned that her lover doesn't push himself beyond human limits in his desire to see his dream realised. Mimi, still in her teens, is desperate to spread her wings and chafing at the limits placed on her movements by her overprotective older brother. When Mimi gets into a relationship with a neighbour intent on fighting the new development, Sebastian's precarious mental health spirals out of control putting them all in danger. When Mimi is lost amidst their twists and turns the race is on to find her before the water rises.