The Lock of the Tree...

A few days passed and Ava and Eli were still unable to find any use for the silver key they had found in the box. They searched everywhere, including the platforms and stairs, and even had Ava climb the thin branches of a tree, but all she found were endless leaves.

During the day, they attended university and at night they played Fragmental. There wasn't much excitement during lectures, except for a few exchanges between Leonard and Theo.

Theo would threaten Leonard, but Leonard remained indifferent and kept his emotions hidden behind an expressionless face. This made him even more mysterious, causing many at school to speculate about him.

'I heard he worked as an assassin...'

'He was born without a part of the brain responsible for emotions...'