Ka, the time-travelling cat, has disappeared, leaving just one clue. Topher soon realises that she has gone back to Elizabethan Engl&, & he fears that Ka is in terrible danger. Cats were tortured in Tudor Engl&, so Topher must try to find her before it is too late. In doing so, he meets Queen Elizabeth & Doctor Dee, the court magician & astronomer, who thinks Ka can help him find the elusive Philosopher`s Stone. An exciting & transporting fantasy, exploring both contemporary & ancient issues.