Poppy's a free spirit. Alex loves a plan. After years of summer vacations, these polar-opposite pals wonder if they could be a perfect romantic match.

Students Hayley and James are young and in love. After saying goodbye for Christmas at a London train station, they both make the same mad split-second decision to swap trains and surprise each other. Passing each other in the station, they are completely unaware that they have just swapped Christmases.

During a night out, David and Siri meet Camille. A flirtatious game begins where the boundaries are gradually dissolved. In an act of submission of the moment and drunken curiosity, they have a threesome.

Set in the glamour of the New York and Paris art scenes, gallery owner Brooke Gatwick and her newscaster husband Owen, face temptation, jealousy, twists and mystery when two seductive newcomers enter their lives.

The super-charged comedy-horror series is a modern take on the classic whodunit with a killer cast.