Amos Decker is adorably miserable when he was ordered to take leave. He didn't have anywhere to go so he followed Alex Jamison and visit ther sister.
So he was just hanging out. The thing I like about Amos is that he was like me, and prefer to hide or get out of the way of the party at a corner, or a balcony or at the back yard. That's what he did.
So he talked to a kid who is 6 and then at a flash caused, he saw something. Run across a quiet street and investigate. He crashed the door to go in because he thought he smell something burning and someone might be in trouble.
What he found is two dead bodies.
And he called the police.
Not very competent police. Instead of being an opinion from Amos or Alex, the scene was setup so that the cop almost shoot at an FBI agent because he is too trigger happy.
Nice. Amos insert himself to the investigation as he is not confident that the local police could handle this. Even more so if this is not the first two dead bodies but number 5 and 6 in the last few weeks.