Braeden, when the work is done days later, tells you of the stone chest once back on the ship and you all meet, "The chest was made of stone and it took some doing to get open without triggering anything. There was a physical lock and magical protections, including a contingency should knock be cast upon it. Luckily, I knew the best people to talk to about such things. Had we cast knock on it ourselves; it would have magically teleported away, assumed the magic had not faded. The chest is about one hundred and fifty years old, from a time when the Kingdom of Icefia was trying to woo back Layraedia. King Joscian took a different tact than his predecessors. When he heard that one of the leading families of Layraedia had their only child sick, he went about trying to heal her to mend fences. He had a book crafted, and that is what is in the chest. Dark Sea destroyed the ship it was traveling in, and claimed the chest and its many treasures, meant for Layraedia."
He breathes and smiles. "The child could not be cured by normal means. The condition was one of born infirmity. The book, magical in nature, sought to make the child more fit. Considerably more healthy. My contacts tell me it is worth over 100,000gc."