Possomly, tyrant, and rocket

When the bomb was finished, Professor Possomly told the tyrant that it was very complicated and someone would have to fly the rocket. They would obviously be blown up with it.

Now he no longer needed her, the tyrant ordered her to do it.

Moogie, Koliander and Minda Melch would have to go with her.

If they tried it to trick him, he would kill of the rest of their family.