When Professor Connor Macpherson (Mac) and his team finally developed a device that could send electronic messages back in time, little did they realise the effect it would have on people in the past.

But they soon understood when they received a message from the future using the same technology, making them unwitting participants in a desperate race to save the world from imminent destruction.

Is the world plummeting into an inevitable end or can Mac and his team save it by changing events in the present?