Following on from the first series of Pirate Islands, The Lost Treasure of Fiji is essentially a computer game. The characters find themselves pulled into this alternate reality world, and must try to find their way back out.
After uncovering the Orb of Osiris, Kirra is mortally wounded by Lilly. Tyler has to pull out all the stops to retrieve the orb, revive Kirra and find the way to get them out of the game.