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Kendra the evil Valkyrie sorceress has stolen treasures from the gods including the belt of strength worn by Thunor and will use them to gain alliance with the fierce giants of Jötunheim.So now the children must face a perilous world of tall mountains, deep forests and icy wastes in an attempt to foil their enemy's plans.The land and weather though is not the greatest peril they must overcome for the Frost Giants of Jötunheim are a foe more fearsome than any they have faced before.

Everyone is searching for pieces of 'The Crown of Knossos:' historical artefacts which when assembled allow control over all of history in this and in the Twisted reality. The Hourglass Institute, Redfeld's masters and even the Directorate are soon in the hunt. One by one the pieces are found but eventually Tom and the others discover who is really after The Crown and what their motivations are. It is only then that they realise the extent of the danger, for 'Yesterday's Treasures' can mean the destruction of tomorrow. Yesterday's Treasures is a Young Adult Fantasy Novel and is the sequel to Tomorrow's Guardian