Hector Hugo

When Castle and Beckett learn that a murder victim may have been poisoned at an Old West-style resort, they visit the resort posing as newlyweds to uncover the truth.

When prostitutes in Miami are discovered murdered in a similar style to local animals found dead there, the BAU must work fast to find an UnSub whose confidence is quickly escalating.

The team welcome back Emily Prentiss when they are called upon to investigate the disappearance of three women.

On Murtaugh's first day on the job as interim captain, the wife of a popular businessman is abducted and the squad finds a connection in the case to Rigg's father. Meanwhile, Riggs is left to grapple with his family and work.

Upon buying items from a homeowner for her antique shop, Melinda encounters the spirit of an angry young boy, who she later learns is the homeowner's dead son. After witnessing life-threatening behaviour against his mother and baby sister, Melinda realises that the young boy needs help releasing anger toward his mother and decides to take on the challenge of helping him communicate with her so he can finally cross over.

Selina and her staff get ready for inauguration day. Mike suffers exhaustion, and Catherine gets a makeover.