'Zack and Stef search for a secret passage a hidden door or anything that will lead them to the treasure hidden in Blackloch Castle. Soon Zack finds himself looking for answers about how we got the Bibles we have today. It's a race against time to crack the case in this tenth adventure for Detective Zack.','Detective Zack 10 - Detective Zack: The Secret of Blackloch Castle by Jerry D. Thomas
