Okay, so this was a pretty interesting entrance point: a man named Jack Burnelle keeps trying to get Holmes and Watson to investigate his son's assault that resulted in his son being in a coma and dying. But despite repeated requests, Holmes and Watson were always too busy to take his case. With the statue of limitations running out, Burnelle gets desperate. He takes a diner full of people hostage and demands Holmes solve his son's assault-turned-murder before midnight. Watson remains at the diner as collateral/increased motivation.
So Holmes and Bell dive in. Of course the whole thing goes back to gangs. This show is really into gangs lately, which for me is just another take on Mafia/organized crime; in short, I don't find it very interesting. At least not usually. But (many plot turns later) this gang happens to be smuggling maple syrup. Now that's pretty entertaining.
Meanwhile, Watson's attempts to forge a connection with Burnelle are textbook and not terribly engaging. At no point do we really believe she or the hostages are in much danger. Even the one hostage Burnelle is truly angry with—a police detective who Burnelle feels did nothing to solve his son's case—doesn't bring much emotional impact to the story. I feel like there could have been more here, but maybe it was all edited out for time?
Still, overall this was one of the better episodes.