This provocative, thrilling drama finds four friends caught in a storm of excitement and self-discovery, secrecy and betrayal as they are drawn into the world of illicit and complex relationships. 30-something friends Katie, Trudi, Siobhan and Jessica met at university, but their lives have taken very different turns. Katie, a doctor, has been having a relationship with one of her patients; Trudi is grieving a husband lost in 9/11; bubbly bed-hopper Jessica remains ecstatically single, while lawyer Siobhan seems happily married.