To conduct the perfect raid under the strict military brass, the crew is forced to team up with Jason's longtime rival.
The BAU team up with the organised crime unit to investigate an up-and-coming congressman's political enemies when his wife disappears.
Hetty and the team continue searching for an elusive book that has the attention of foreign security agencies.
When a body is found at a sci-fi convention, Castle and Beckett are warped into the heart of fandom.
Maya's announcement shocks Sam and Naomi; Pete challenges Fife on a patient with a cutting-edge bionic arm.