| In Chicago, Marissa Irvine arrives at 14 Arthur Avenue, expecting to pick up her young son Milo from his first playdate with a boy at his new school. But the woman who answers the door isn't a mother she recognizes. She isn't the nanny. She doesn't have Milo. And so begins every parent's worst nightmare. |
| Name | Character | Episodes |
|---|---|---|
| Dakota Fanning | Jenny | 1 |
| Sophia Lillis | Carrie | 1 |
| Michael Peña | Detective McConville | 1 |
| Jake Lacy | Peter | 1 |
| Sarah Snook | Marissa Irvine | 1 |
| Abby Elliott | Lia | 1 |
| Thomas Cocquerel | Richie | 1 |
| Jay Ellis | Colin | 1 |
| Daniel Monks | Brian | 1 |