The Most Beautiful Species Alive

The same two Autumn days are repeating over and over again. Five teenagers in New Zealand know what is going on. They have several tasks to do to help to defeat the bad aliens who are doing it. The five are Polly, Kimmy, Oli, Issiah and Hector. Most of the action happens in the city of Courtney on Planet Shogasaah. They need to solve clues to complete each task. They need to think all the time, and it's a bit like they are playing a strategy computer game and constantly figuring out what they need to do. The clues get more and more complicated as the story progresses. Perhaps you as the reader could figure things out before the five do.