** A harrowing hunt in the California gold country **
A young man disappears in the Mother Lode wilderness. He leaves behind a gold-flecked rock and a vial of toxic mercury. He is a misfit in the modern world, a throwback to the Gold Rush days.

A venture capitalist--whose gold country is Silicon Valley--hires forensic geologists Cassie Oldfield and Walter Shaws to track his missing brother.

Following one of the 'lost rivers' of California, Cassie and Walter plunge into the dark history of the legendary lands, into the dark past of the brothers, into a poisonous sibling feud that threatens both lives and the land.

And they are not the only ones on the hunt.

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