The View from Infinity Beach by R.P.L. Johnson

Five friends, trapped inside a secret paradise:

An industrial prince, heir to the new world his family has built;
A dreamer from Earth who’s finally found a future worth fighting for;
A trainee mech pilot, whose skills are about to be tested;
A pop star: still in her teens but already yesterday’s news;
And the sociopathic hacker that got them into this mess.

Escape is only the start of their adventure.