Shadow & Light — Sandra C. Stixrude

When things begin to go wrong, they have a habit of going spectacularly wrong, Lord Telluris Marat discovers. Robbed of his visions and his ability to prophesy, he still has his will to fight and his ability to command an army. But the enemy he faces now commands weapons that rival his worst nightmares.

Emily struggles with her own visions, and finds herself caught between worlds. Jake Montagna, the president of the interplanetary mining company, has gone off the deep end and will stop at nothing to get what he wants. If only they were in broadcast range of the authorities, Emily could do something. But Arhanna is far out of normal shipping lanes. To stop Jake, she'll have to do it herself.