Book two of the Hourglass Institute Series
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 the sequel to Tomorrow's Guardian.