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 | |
|---|---|---|---|
| Kate Brook | Writer | ||
| Sophie Hannah | Writer | ||
| Tom Goodman-Hill | Guest Star | ||
| Peter Wight | Guest Star | ||
| Amy Beth Hayes | Guest Star | ||
| Elly Fairman | Guest Star | ||
| Rupert Graves | Guest Star | ||
| Charles Martin | Director |