Edge of Darkness episode 3, Burden of Proof
Now, I'm not a big fan of police dramas at all and I only watched it because Bob Peck plays the main character...but ohhhhhh I love it! It's only a mini series and pretty much just focuses on the one character, plus it's more about the investigation and the emotions of said character.
Also Bob Peck.
Something about that man just strikes me as incredibly dreamy <3