When Uncle John Forbids Mandie From Joining His Quest To Keep An Old Promise, Jason Bond And Mandie's Newfound Mother, Elizabeth, Make Other Plans. Mandie And Friends Then Embark On A Harrowing Journey By Train To Protect Uncle John. Grand Adventure Ensues As They Struggle To Solve Riddles And Dare To Face The Secrets Of Lost Antler Cave-Mine. However, Mandie's Most Difficult Challenge Arises When She Realizes That Success Will Land Her Face To Face With The One Person She Never Wanted To Meet.