The Children of the Chapel and the First Christmas

When Miriam, Joseph, John Paul and Zelie Langford find a secret door in their parish church, they immediately go to explore. Upon opening the magical door, they realize that it doesn't lead to just any room- it leads to a mysterious chapel full of ancient relics. When the chapel leads them on a mystical journey to the Holy Land that separates the siblings, will they ever find each other? And will they ever make it back home?