The Essential Sentinel

Flight is the 11^th episode in the series, and the first episode of Season Two.  It's a turning point episode, even among the "essential" ones.  It starts off innocently enough at the PD where we find out that Simon is about to leave for Lima, Peru for a police conference.  He's decided to take his son Daryl on the trip, hoping to reconnect with the teenager.  Blair excitedly gives him a list of "must sees", but Simon already has a big fishing trip planned for after the conference.  Everyone wishes them well.  That's the last normal thing that happens.