Simon Savage, the temponauts and the Time Bureau are on full alert. The Black Death has started to appear in major cities around the world. There are fears of a global pandemic. The plague has been carried to the present time by the fleas on rats from the fourteenth century. But who is behind this deadly scheme? It is up to the temponauts to find out. Meanwhile, Simon must find his family. Where have they gone? Will he be able to unravel the clues of their disappearance? And can he protect them from the Time Bureau itself?