A young hoodlum whom Baretta had arrested in the past escapes from the convict bus aboard which he was transported, and the the runaway and the hostage situation. You have understood that it's mostly an action story which you deal with, with as usual a little character study. But unfortunately so predictable. No it's certainly not the best Baretta episode so far, except maybe in one of the last scenes where you see Baretta behaving rather in a strange way to succeed against the evil boy...
I don't know the director whose it was the first piece of work. You can see it obviously...