A young affluent couple expecting their first child hits it off with the new couple that moves in downstairs, until a dinner party between them ends in a shocking accident.
| Actor | Role |
|---|---|
 Stephen Campbell MooreJustin | Justin |
 Clémence PoésyKate | Kate |
 David MorrisseyJon | Jon |
 Laura BirnTheresa | Theresa |
 Deborah FindlayTessa | Tessa |
 Jonathan HardenMark | Mark |
 Tuyen DoAllergy Doctor | Allergy Doctor |
 Laila AljSonographer | Sonographer |
 Christos LawtonPhil | Phil |
 Stephanie JacobRegistrar | Registrar |
 Natasha AldersladeBabyshower Woman (uncredited) | Babyshower Woman (uncredited) |
 Anna MadeleyAbi | Abi |
 Sarah MalinSonographer 12 Weeks | Sonographer 12 Weeks |
| DDaniel EastonKate's Colleague | Kate's Colleague |
 Franc AshmanIndhu | Indhu |
 Sam PamphilonTom | Tom |
| EElliot MillsBaby Billy | Baby Billy |
| JJoseph MillsBaby Billy | Baby Billy |