After what felt like an eternity of searching, they finally came upon a clearing. At its center stood a massive oak tree, its gnarled branches stretching out like ancient arms. The tree's trunk was wide and sturdy, its bark rough and weathered with age.

"This has to be it," Michael said, his voice tinged with awe. "It's the only tree that fits the description."

They approached the tree cautiously, unsure of what they might find. As they drew closer, Amy noticed a figure standing in the shadow of the oak, partially obscured by the thick trunk.

"Hello?" she called out, trying to keep her voice steady.

The figure stepped forward, revealing an older man with a weary expression and a kind smile. His clothes were slightly tattered, and his eyes held a mix of hope and desperation.

"Thank you for coming," he said, his voice trembling with emotion. "I wasn't sure if anyone would find the note."

"Are you 'J'?" Michael asked, his grip on the note tightening.

The man nodded. "Yes, my name is John. And I need your help."

He gestured for them to sit on a nearby bench, and they obliged, eager to hear his story. John explained that he had been living in the park for several months, having fallen on hard times and lost his home. He had been searching for a way to reunite with his estranged daughter, who he hadn't seen in years.

"I left that note in the book hoping that someone would find it and help me," John said, his eyes glistening with tears. "I have no other way to contact her, and I'm running out of time."

Michael and Amy exchanged a glance, both of them feeling the weight of John's plea. "Do you have any information about your daughter?" Amy asked gently. "Anything that might help us find her?"

John nodded and pulled out a crumpled photograph from his pocket. It showed a young woman with bright eyes and a radiant smile. "Her name is Emily. She used to work at the coffee shop on Maple Street. That's the last place I knew she was."

Determined to help, they decided to start their search the following day. They exchanged contact information with John and promised to return with any news. As they left the park, the sky was painted in the deep purples and blues of twilight, and a sense of purpose filled the air.