Mona has just moved into a new house with her mum, step-dad and baby brother, when strange and weird things start to happen. First she is visited by aliens, who need her help. Then she discovers that her dad didn't really die at sea but is instead held prisoner in the land of Seapania. But his time is running out. If Mona believes what her new alien friend Jo-aag has to say, she needs to rescue her dad fast.