When the bodies of a mother and her young daughter are found in the bathroom of their luxury home, new DS Charlie Zailer and her junior colleague DC Simon Waterhouse investigate. The pair immediately clash, disagreeing over whether the case is a murder-suicide or something even more sinister. Elsewhere, young mother Sally Thorne tells her best friend that she had an affair with the husband of the dead woman, and her friend warns her to stay away.
| Name | Type | Role | |
|---|---|---|---|
| Sophie Hannah | Writer | ||
| Kate Brook | Writer | ||
| Rupert Graves | Guest Star | ||
| Tom Goodman-Hill | Guest Star | ||
| Peter Wight | Guest Star | ||
| Amy Beth Hayes | Guest Star | ||
| Elly Fairman | Guest Star | ||
| Charles Martin | Director |