J.F. Penn's 'Stone of Fire' is an entertaining and fast-paced story that follows the main characters on a quest to recover the 'Apostles Stones'. These religious artifacts, allegedly taken from the tomb of Jesus, are imbued with powers derived from the Pentecost, capable of being used for both good and evil.

The narrative takes readers on a whirlwind tour of religious sites around the world, including the Vatican, adding a rich layer of historical and cultural intrigue. However, much like the Indiana Jones movies, the religious elements in 'Stone of Fire' don't delve too deeply. Instead, these artifacts are attributed almost magical powers, and the religious sites serve primarily as dramatic backdrops for the action.

While the stakes and motivations of the characters are clearly outlined, this sometimes comes at the expense of narrative surprise. The predictability of the plot can cause the story to lose momentum, especially in the second half. Nevertheless, Penn's ability to weave intriguing tidbits about ancient history and mythology keeps the reader engaged, even when the story's pace wanes.

Overall, 'Stone of Fire' offers a light and entertaining read that blends action, history, and a dash of the supernatural. It may not challenge you with deep philosophical questions, but it delivers a thrilling adventure that is perfect for a quick escape from reality.