For months, the BAU has tried to catch this one killer. They'd leave a clue behind. The team would get *so close, but they ended up losing their trail.

This unsub was intelligent. They'd leave notes and hints for certain team members of the BAU. Spencer would get the most of them.

Now, as Spencer walked down an empty street towards his apartment, his mind ran through all the evidence the BAU gathered on this killer.

He didn't notice the second pair of shoes that joined his walk.