Heart of Stone follows geologist Henry Stanwick as he accepts an invitation to traverse Madagascar's jagged limestone pinnacles with American adventurer Tim Vaughan. What begins as a field expedition becomes unsettled by doubts about Vaughan's identity and strange references to prophecy.

The novel blends rugged field description with psychological suspense: treacherous terrain, cryptic warnings from colleagues, and the slow reveal of a strange name — Jezreel — that ties personal risk to unexpected portent.

Readers who enjoy atmospheric adventure and intellectual puzzles will find the combination of geological detail and mounting mystery compelling. Published by Crossway Books in 1990, the story emphasizes setting, character tension, and moral ambiguity over easy answers.

Highlights

• Setting: Madagascar's pinnacles and hazardous limestone formations
• Focus: geology, identity, prophetic mystery
• Tone: suspenseful, introspective, exploration-driven

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