Castle uncovered a money trail that led to bank that had its files destroyed in a suspicious warehouse fire. Before he was killed, Captain Montgomery mailed a package to a mystery man. It’s filled with evidence. Once the man sees what’s inside, he places a call to the congressional offices at the U.S. Capitol. Just how deep does this case go?

Speaking of cases, Ryan and Esposito catch the murder of celebutante Sonya Gilbert, who was shot in her security apartment. The victim’s boyfriend, Dale, left the place several hours after the murder went down. The team tracks Dale to his band’s rehearsal space. When the suspect pulls a gun on Beckett, she freezes. Backup arrives just in the nick of time. No one notices Beckett’s trembling hand. No one but Castle.

Beckett and Castle question Ron Halstead, the fire inspector who signed off on the mysterious warehouse fire as an accident. Beckett doesn’t believe him and she lets it be known loudly. Castle’s obvious concern is escalated when the mystery man we mentioned earlier calls saying he’s a friend of Montgomery’s. He says Beckett is safe as long as she stays away from the case. Unfortunately, that hasn’t happened yet.

Castle is worried about Beckett and Alexis is worried about her father. She says, “You need to grow up, Dad. You’re a writer, not a cop. Stop pretending.” These words hit home, as do the ones Castle lays on Beckett when he begs her to slow down. One way she can do so is by helping solve Sonya Gilbert’s murder.