Chapter 5 - The Forbidden Floorboard

Without waiting for Graham's response, Callum turned and marched up the grand staircase toward the east wing of the mansion, where the blue guest room had remained locked for decades.
Harper supported Vivian as they followed close behind, while Graham trailed them with heavy, hurried steps, his face growing redder by the second.
"Callum, stop this madness!" Graham demanded, his voice echoing through the long, carpeted corridor. "You're letting a maid and a senile woman ruin our family's reputation!"
Callum ignored him, taking the tarnished brass key from Harper and inserting it into the heavy oak door of the blue room.
With a long, creaking groan, the door swung open, revealing a room covered in white dust sheets and frozen in time.
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Callum walked straight to the window nook, pulling back the heavy velvet curtains and kneeling down on the hardwood floor.
👉 What was buried inside the hidden compartment under the floorboard?