This series follows a group of 18-year-olds who move to London in the early '80s. At the same time, reports begin to come in of a new disease that has made its way across the Atlantic. So little is known about the virus, that it's simply termed 'this cancer thing in New York', affecting gay men in the US.
But over five episodes, we watch as these five characters – and an entire generation of gay men – have their lives turned upside-down by the HIV/AIDS crisis.
The series is loosely based on the experience of creator Russell T Davies ("Queer as Folk") and those of his friends, who lived through the 1980s AIDS crisis. Like his characters in "It's A Sin," Davies was also 18-years-old at the time.