This week on Castle the shadow of the 3XK serial killer looms large over our favorite crime fighting team. While Castle's fun romps like the super hero and heads-on-ice episodes are always a good time, it's the more serious mythology pieces the show always hits out of the park. This week is no exception when Ryan's stolen service weapon allows the audience to find out more background about the team's most cheerful member.
Seamus Dever, who plays Ryan, really gets a chance to shine in this episode as Ryan slowly unravels from anger and guilt. It's also great to see the team rally around another member. We all love Castle and Beckett (and Caskett, let's be honest) but it's nice to see some of the fantastic supporting players get a chance in the spotlight. It's also great to have an ongoing nemesis like the 3XK killer out there somewhere, ready to strike. My guess is around sweeps time.