Castle knows the quicker they solve this case, the faster he can get Beckett away from the handsome billionaire. Vaughn’s attorney, David Anderson, pushes to keep the business going forward despite all that’s happening. He’s worried that Arthur Felder’s funding will disappear now that he’s dead. The poison that killed him was created in a lab that Vaughn owns. His top researcher, Cindy, got upset recently when her boss rejected her advances, but she swears she would never hurt Vaughn. Castle follows another lead. He believes Cory Harrison is involved in the murder. He’s right. Esposito and Ryan find the busboy shot to death in his apartment.
A bottle found in Cory Harrison’s apartment contains the toxin that was used to poison the food. The killer who was in cahoots with the busboy killed him to tie up loose ends. Vaughn is still in danger. That’s why he and Beckett check into a safe house. Actually, they check into a luxurious hotel suite. Beckett puts the kibosh on a room service meal, but she does let Vaughn have some champagne. The billionaire almost loses an eye when he pops open the bottle. Beckett helps heal his wound with some ice. Then she joins him for a little bubbly.
The team realizes a mystery man was forcing Cory Harrison to kill Vaughn by threatening his daughter. They can’t get a clean look at the guy’s face on surveillance video, but the slug pulled from the busboy help ID him as a professional killer named Thomas Barber. Beckett orders Ryan and Esposito to track down this lead as she continues to watch Vaughn closely. She admits that she’s with Castle, but pauses when asked how serious it is. Vaughn sees this as an opening to lean in to kiss Beckett. BANG! BANG! Two bullets pierce the window inside the hotel room barely missing both Vaughn and Beckett.