The Sphere of Dromassian

When the planet Ilansia is struck by a deadly plague Cassaendra is sent to Earth to search for the only device that can save her planet, the Sphere of Dromassian. The Darn, enemies of Ilansia, also know of the Sphere's existence but they don't know it's on Earth. They plan to use the device as a weapon against the Ilansians and put an end to the age old war. If they learn of the Sphere's location they will send an army to retrieve it and countless lives will be lost, both on Earth and on Ilansia. Cassaendra must find the device before they do without revealing who she is to anyone on Earth.
As she searches she learns that the Darn have sent the Kaeta, their most deadly warriors, to Earth. She's running out of time and there's still no sign of the device. Can she find the device in time and avoid capture by the Darn?.