Profession Series - Geologist (Mine and Quarry)

Jude Low is a highly skilled geologist. His ability was noticed by Vanessa, and so she ‘invited’ him to help her to find a rare ruby. Jude Low had no choice but to agree to her commission. The ruby was the final key to unlock the mysterious stone wall that was left behind by Vanessa’s father. It also attracted criminals who coveted it. Who would find the ruby first?

What was the secret behind the stone wall?