Twelve year old Kate Dawson is unhappy at home. Her widowed mother has remarried and Kate has a stepfather and a six year old half-sister, Emma, who is nothing but a pest. She knows the resentment she feels towards Emma and her stepfather is making her mum unhappy, but Kate is confused by the deep feelings of guilt and jealousy that plague her.
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Stranded on the hottest planet, she's got the job assignment from hell. And then the trouble starts...Bruised by tragedy, Space Corps agent Elfrida Goto accepts an assignment on Mercury, the factory of the solar system. But she's soon swept up in an election that could lead to the evacuation of the planet's…
One morning, Emma disappears down a mystical looking well. Irritated but worried, Kate follows and the two girls are thrust into the tunnels of Miu, an unknown place built within the lava tunnels of an extinct volcano. They meet a young Miuan princess and her guard, who are on the run, and the girls are instantly swept into a danger that will test their skills, their friendship and their love.