As Olivia explored deeper into the garden, she noticed a stone pathway she had never seen before. It led to a small, hidden shed covered in ivy. The key seemed to fit the lock on the shed door perfectly. With a slight tremble in her hand, she inserted the key and turned it. The door creaked open, revealing a room filled with old gardening tools, dusty books, and a large, beautifully illustrated journal. 'This must be Grandma's secret garden journal,' Olivia realized, her heart racing with excitement.