Z | Zoe | Maisey | Gifted concert pianist, Tessa's niece |
| Lucas | Kennedy | Gifted concert pianist - step brother to Zoe |
| Marie Maisey | Kennedy | Mom of Zoe, Stepmom of Lucas, Tess's sister |
| Tessa | | Zoe's Aunt, Maria's sister, Vet |
S | Sam | Locke | Criminal lawyer, having an affair with Tessa |
| Zoe | Guerin | aka Zoe Maisey |
| Jeanette | | Sam's secretary |
T | Richard | | Tessa's husband |
| Philip | Guerin | Marie's first husband |
Z | Mr. Tom | Barlow | Zoe killed his daughter |
| Amelia | Barlow | Tom's daughter (aka Amy) |
| | | Police Sergeant |
| | | Social Worker |
T | Chris | Kennedy | Marie's second husband |
Z | Katya | | au pair |
| Grace | Kennedy | Lucas & Zoe's baby sister |
| Barney | Scott | Katya's boyfriend |
| Jack | Bell | Popular guy at school (also died in the accident) |
| Eva | Bell | Popular girl at school |
L | Julia | Kennedy | Chris's first wife, Lucas's mom |
S | Ruth | | Solicitor |
| Gull | | Zoe's best friend |
| Jason | | Key worker |
| Granny | Guerin | Zoe's Grandma |
| Douglas | | Eva's boyfriend |
| Conner | | Friend in the Unit (breaking & entering - repeatedly) |
| Ellie | | Friend in the Unit (common assault, three strikes & you're out |
| | | Family liason officer |
| | | Detective 1 |
| | | Detective 2 |
| | | Officer with DNA test |
| Tamara | Jones | Au pair representative |
| | | Consultant who reads Sam's scan |
| | | Doctor |
| | | MS specialist |