A Glass Darkly - Glass Trilogy, #2

A dead volcano called Glass Mountain in Northern California seems harmless...but is it really?Andromeda Jones, a physicist, knows her missing sister Samantha is somehow tied up with the new job Andromeda herself has been offered to work with a team in constructing Vox Dei, a machine that's been ostensibly built to eliminate wars. But what is its true nature, and who's pulling the strings?When the experiment spins out of control, dark powers are unleashed and the danger to mankind unfolds relentlessly.
Strange, evil shadows are using the Vox Dei and Andromeda's sister Samantha to get through to our world, knowing the time is near when Earth's final destiny will be decided. Federal forces are aware of something amiss, so, to rescue her sibling, Andromeda agrees to go on a dangerous mission and soon finds herself entangled in a web of professional jealousy, political betrayal, and flat-out greed.