Mystery. Thrills. Adventure. Books 4 & 5 in the series: SKELETON SEA: A mystery at sea plunges forensic geologists Cassie Oldfield and Walter Shaws into deadly waters. When a boat is found deserted off the California coast, it looks to be a simple fishing accident. But there is nothing ordinary going on here. The geologists track the strange incident to an even stranger project. Someone with toxic skills is at work in this sea. RIVER RUN: There are plenty of ways to die in the Grand Canyon. The geologists investigate one way: Stranded raft. Life vests unused. Rafters missing. The only clue to the fate of the rafters is a bag of pebbles caught in the bowline. Following that clue, the geologists uncover a hellish scheme. Not only are the rafters in peril, but the river itself is under attack. -- All books in the series are complete novels, and can be enjoyed in any order. -- Book #1: Quicksilver -- Book #2: Badwater -- Book #3: Volcano Watch

Mystery. Thrills. Adventure. Books 4 & 5 in the series: SKELETON SEA: A mystery at sea plunges forensic geologists Cassie Oldfield and Walter Shaws into deadly waters. When a boat is found deserted off the California coast, it looks to be a simple fishing accident. But there is nothing ordinary going on here. The geologists track the strange incident to an even stranger project. Someone with toxic skills is at work in this sea. RIVER RUN: There are plenty of ways to die in the Grand Canyon. The geologists investigate one way: Stranded raft. Life vests unused. Rafters missing. The only clue to the fate of the rafters is a bag of pebbles caught in the bowline. Following that clue, the geologists uncover a hellish scheme. Not only are the rafters in peril, but the river itself is under attack. -- All books in the series are complete novels, and can be enjoyed in any order. -- Book #1: Quicksilver -- Book #2: Badwater -- Book #3: Volcano Watch

► USA Today Bestseller ◄ THERE ARE PLENTY OF WAYS TO DIE in the Grand Canyon. Forensic geologists Cassie Oldfield and Walter Shaws investigate one way: trouble on the canyon's Colorado River. Stranded raft. Life vests unused. Rafters missing. The only clue to the fate of the rafters is a bag of pebbles caught by the bow line. Following that clue, the geologists uncover a hellish scheme. Not only are the rafters in peril, but the river itself is under attack. The race to stop it takes Cassie and Walter deep into the canyon, and onto the mighty river, putting their own survival at stake. ► All books in the series are complete novels, and can be enjoyed in any order.

-- The search for a missing man leads into the dark heart of the California gold country. -- A YOUNG MAN DISAPPEARS in the 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 Gold Rush days. A hotshot venture capitalist--whose gold country is Silicon Valley--hires forensic geologists Cassie Oldfield and Walter Shaws to track his missing brother. The geologists are hooked by the story of this lost man, this wounded soul. And they have the skills to find him. It's what they do: view a rock under the microscope and unravel a mystery. Solve a crime. Prevent a crisis. Find a missing person. Joined by their insistent client, Cassie and Walter track the mineral clues deep into the mountains. Along the way their journey turns harrowing, plunging 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. -- All books in the series are standalone novels and can be enjoyed in any order. --

NO WAY OUT--so says the note in the pocket of the murdered mayor. The volcano beneath her town is seething, and the town's fate now rests in the hands of an emergency planner with a twisted agenda. The mayor's death is personal for investigators Cassie Oldfield and Walter Shaws. This is their hometown. They are desperate to save their families and friends. Their field is forensic geology, and they know how to track mineral clues to find out where the mayor went—and what she found. As the volcano moves toward red alert, Cassie and Walter race to prevent 'no way out' from becoming a prophecy. • All books in the series are standalone novels and can be enjoyed in any order. •

A MYSTERY AT SEA plunges forensic geologists Cassie Oldfield and Walter Shaws into deadly waters. When a boat is found deserted off the California coast, it looks to be a simple fishing accident. But there is nothing ordinary going on here. The geologists track the strange incident to an even stranger project. Someone with toxic skills is at work in this sea. Cassie and Walter are forensic pros--but they are up against a master in an undersea world where they don't belong. They must face their deepest fears in order to end this project. If they fail, lethal creations will be unleashed. Unstoppable. ► All books in the series are complete novels, and can be enjoyed in any order.

First published in 1975 and updated in 1992, Forensic Geology by Raymond C. Murray and John C. F. Tedrow was a classic in its field. Now Murray has thoroughly revised and updated that earlier work to produce Evidence from the Earth: Forensic Geology and C