Ace finds herself separated from the Professor, marooned, blind and cared for by a mysterious stranger. How did she get there? Who is Dorsai? What secret is he hiding?

The death of a nameless traveller on a flight to the volcanic Hedistic islands would seem to have been natural. But when his young friend starts her own murder investigation, she uncovers a plot which threatens the safety of the entire planet....

It is the time of the Second World War, and all is not well at a top-secret research base in Greenland. The British have been testing a new device which could bring about a swift end to the war with Germany - but the trials have gone disastrously wrong. When the Professor and Ace arrive, they encounter an isolated community not only under threat from its human enemies, but stalked by a horrifying menace with a voracious appetite for survival.

Travelling on the luxury train service to Vienzza, The Dominie and Alice discover that one of their fellow passengers is a killer: but which one? As time runs out and the body count begins to rise, the Time Travellers realise that things may not be all they seem.

In search of the legendary "Point of Stillness", the Professor and Ace find themselves in an old house, steeped in evil. Who is the ancient woman in the attic? Why are there so many clocks? And did the butler really do it?