Michelle Williams

As a patrol officer, Jenn Penton is constantly facing new challenges - with every traffic stop, every call, every assignment. She's called upon to solve problem after problem, day after day, and is one of the department's best. But her family has shown her that life doesn't always present issues that can be solved in short order. Her twin sister Melissa has been battling addiction problems for years, and after a few recent setbacks, has reached back out to Jenn - maybe for the last time - for help. On the fugitive unit, meanwhile, Winston DeLeon and company are pursuing a suspect from a rape case dating back to 1992. DNA testing matched the guy back to the crime, and now the Boston Police has to find him. And Manny Canuto and D Araujo of the gang unit find themselves assisting in another SWAT raid, continuing their unrelenting quest to get as many guns off the streets as possible. Also available on Amazon Instant Video

Terrique Chambers didn't become a Boston police officer because it was an easy job, but after six years on the force, his work is - more than ever - at odds with his family life, and his responsibilities at home. With two young sons, one of whom is autistic, the challenges of working nights in the gang unit are mounting. Meanwhile, his counterparts on the day gang unit are focused on something very different: the Boston Police Department's annual fitness challenge, and their desire to outperform their rivals in the fugitive unit. But Ryan Mason, Greg Dankers and company have a secret weapon in the competition, and they'll get an additional boost of momentum if they can first track down a dangerous criminal said to be hiding out in Dorchester. Also available on Amazon Instant Video

It's been a little more than a year since gang unit officer D Araujo found himself staring at the wrong end of a gun at close range on a chase for a suspect. He made it out, but the experience has stuck with him, particularly on cases like the one he's on now - teaming up with the SWAT team to capture a suspect who's been involved in a series of gun battles in Mattapan. Meanwhile, over on the fugitive unit, Greg Dankers works days tracking down criminals while his wife Nancy, also a cop, works nights. With twin boys at home, that doesn't leave many openings for date nights, but as he pursues a suspect, he's hoping there will be enough time to cook his wife dinner after the catch. And for patrol officer Jenn Penton, the ongoing events with her troubled sister is a reminder of how much family matters. Also available on Amazon Instant Video

As one gang unit cop looks to solve a final case before a big promotion, another grapples with the anniversary of a personal loss.