Happy couple Dan and Emily live in a huge house just outside Glasgow and want for nothing, save a baby of their own. Through a chance encounter they meet Kaya, an 18-year-old from the other side of the city, whose life is as precarious as theirs is comfortable. When Kaya agrees to carry their baby, it feels like they were meant to meet, but was it really by chance?

• Sophie Rundle
• Martin Compston
• Mirren Mack
• James Harkness
• Christine Bottomley
• Fiona Bell
• David Hayman
• Katie Leung