Michelle Gillette

As the BAU travels to Miami to investigate a series of bizarre, ritualistic murders, Reid suffers a series of blinding headaches and hallucinations that leave him concerned for his health.

Dina investigates a theft at the store, inadvertently ruining everyone's Halloween plans in the process.

The squad is called in to identify the victim and track down a killer when a severed human foot washes up on shore.

Peralta is trapped by divided loyalties after the warden persuades him to investigate prison gang leader Romero's drug-smuggling operation.

Marcus is in love with his lab partner and seeks help from Will on how to go about it and get invited to her birthday party. Will tries to get back with Dakota, who's still upset with being lied to.