Yoko and the Gatekeepers are at the centre of a game of power in both worlds, involving geopolitics, ideologies and economic power, as well as open and hidden wars. There is no escape from the expectations and threats placed on them: they must play the game with its gambles, twists, losses and deaths, as the future of the people in each world is at stake. The Gatekeepers get their hands dirty. Dirty and bloody. It is a matter of survival.
On both sides of the Fog, the worlds are changing.
On both sides, the change is violent.
Optimum is the last book of the Horizons trilogy, in which suspense is at its peak and the stakes alarmingly high following the events in Chaos.
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