Following the events of Raven's Gate (which took place a few weeks before the beginning of Evil Star), Matt goes to a new private school which the Nexus are funding, but is left friendless because of a bully named Gavin Taylor, causing Matt to injure Taylor by using his powers.

Susan Ashwood and Fabian, members of the Nexus, ask him to help them acquire an old diary which could enable them to stop a second gate that keeps the Old Ones out of our world from being opened.

The Nexus persuade Matt and his carer, Richard Cole, to fly to Peru, find the second gate, and stay at a house belonging to Fabian.

However, on their way to the newly planned rendezvous, the Hotel Europa, the car is ambushed and Richard is kidnapped; luckily Matt manages to escape.

Thinking Salamanda had Richard kidnapped, Matt and Pedro travel to his hacienda in Ica, but they are discovered.

However, Rodriguez and the police arrive, but Matt and Pedro escape with the help of several Incas, led by Micos' brother, Atoc.

Based on the Salamanda's knowledge of their movements, Matt and Richard deduce that there is a traitor in the Nexus tipping him off.

Matt and Pedro break into Salamanda's media headquarters with the aid of the Incas in an attempt to stop his plan, by destroying the radio mast controlling the satellite.

At the control centre, it is revealed that Fabian is the traitor in the Nexus, having believed it was pointless to try and stop the opening of the gate.

This explains the reason why the street Pedro lived in was the only place in Poison Town that was unaffected by disease and how the injuries Matt received at the hands of Captain Rodriguez had healed after only a few hours.