Summary: Through several parables, Jesus mainly talks about the permanence of consequences in choosing to serve oneself.
Response: But it's weird! I'm not sure I've ever read the shrewd manager one that started the chapter, and in between rebuking the Pharisees and his last parable, Jesus launches into a maxim about divorce.
Reading about the first one is a bit disappointing. Still, there's a bigger theme in the chapter about who you're going to serve. Go down swinging for your faults or try to make amends? Break a lifelong vow or honor it? Ignore need or act on it before it's too late? Who am I going to serve?