(From the publisher):
When an ice storm strands Dr. Sable Chamberlin and paramedic Paul Murphy in the southern Missouri hills, they assume they're safe from the mysterious killer responsible for murdering Sable's grandfather and Paul's uncle. But while searching Sable's childhood home and connecting caves for clues, it becomes clear that real danger has followed them. Soon, Sable and Murph, fighting for their lives, discover secrets worth killing for. . .and unexpected treasure more costly than gold.
Original title: The Crystal Cavern
Alternative titles: Hidden Motive
Genre: Fiction→ Crime and Mystery→ Suspense
Fiction→ Romance→ Romantic-Suspense
Fiction→ Religious→ Christianity