This is one of the best TV shows of all time.
I can count on one hand the number of compelling TV shows that have a beginning, a middle and an end. From the first episode, Welcome to Camelot to the last, Goodbye to Camelot, Third Watch was intriguing, true to life television for the entire six seasons of its existence.
Forewarned is forearmed. This is a television series where it doesn't necessarily get solved by the hour's end, where main characters die and good doesn't always triumph over evil. This is the original series that tells the stories of the first responders of the city of New York. Making it even more compelling was it was broadcast during the time of the September 11th attacks. The series weaves reality into its universe and shows us how those events affected its characters. The fact is by the time you reach those storylines in season three, you'd expect nothing less from this series which treated you like an adult from Episode 1.
From some of the creative minds that brought you ER, Criminal Minds and SouthLAnd, I highly recommend this rare series. If you can find it, don't binge it. Savor it. Treasure it. Enjoy it.