[[caption-width-right:257:"Make this more cheerful than my personal life, could you?"]]

->'''Havers''':''[defending her partnership with Lynley]'' You know, call me a snob, Tony, but given the choice between working with a clever, considerate man or a mouthy git, I know who I'd choose.

On his way back from a late-night dinner, Reverend Robin Sage dies from acute food poisoning. The woman he had dined with, Juliet Spence, is also sick but suffers nothing worse than severe vomiting. It turns out that the Reverend had consumed water hemlock as part of his dinner - a deadly poison, which nonetheless does ''not'' cause vomiting. It seems that Juliet Spence spiked the dinner with hemlock and then took an emetic herself. But then, why would she want to kill a harmless clergyman? And was Reverend Sage even the intended victim?

As Lynley and Havers investigate, it seems more and more likely that someone else is behind the poisoning. It could be Steve, the local constable, who is in love with Juliet and might have been jealous of her closeness with the Reverend. It could be Juliet's daughter, Maggie, who resented her mother's affection for Steve and thought that Steve was going to be the dinner guest. Or it could be Polly Yarkin, Steve's jilted lover, who desperately wants to win Steve back from Juliet. And somehow, linked with all of this, are specters from Reverend Sage's past - his dead child Joseph, and his wife who committed suicide.

Meanwhile, Lynley and Havers navigate the first major hazard of their personal relationship, with surprising consequences.

* AbsurdlyYouthfulMother: [[spoiler:Maggie's birth mother was in her teens when she had her, which is why Juliet thought she could take her and no one would notice.]]
* ArsonMurderAndJaywalking: When Lynley has Havers' flat repainted without telling her, Havers calls out Lynley on interfering with her life, of patronising her and being a fascist. Then: "I don't even like duck white."
* BroodingBoyGentleGirl: {{Inverted}} in the Lynley-Helen relationship. Helen, as played by Lesley Vickerage, is far more dark and depressed than Lynley.
* CutHimselfShaving: Polly Yarkin uses the "fell down some stairs" variant when Lynley and Havers see the injuries sustained from Steve beating up on her. They see through it immediately.
* DepartmentOfChildDisservices: Whether intentionally or not, Reverend Sage's [[spoiler: sister-in-law]] seems to be running one.
* DisappearedDad: Maggie's father isn't around, and it's implied he's deceased. [[spoiler:Turns out he never existed, and the closest thing she had to a father was, ironically, Vicar Sage, who was her mother's husband.]]
* FakingTheDead: [[spoiler:Mrs. Sage, aka Juliet, who supposedly committed suicide by jumping off a ferry headed to France, but in fact fled to France for a time before coming back to Britain, kidnapping Maggie from her biological mother and starting her life over. Vicar Sage's death was apparently the result of him finding this out.]]
* FriendshipMoment: Despite her issues with Lynley in this episode, Barbara thinks enough of him to call him a "clever, considerate man" when a particularly vile copper starts slinging insults at him.
* GreenEyedMonster: Polly Yarkin is quite obviously jealous of Steve and Juliet's relationship. Steve also accuses her of hastening his own wife's death while she was dying of cancer, though we never get confirmation of this.
* ItsNotYouItsMe: Helen's reason for deciding she and Lynley are BetterAsFriends after their [[spoiler: one-night stand]].
* LovePotion: The reason [[spoiler: Polly Yarkin]] has a book on herbs.
* MamaBear: Juliet Spence would do ''anything'' to protect Maggie. But then, of course [[spoiler: she is not really Maggie's mama]].
* NeverTrustATitle: Honestly, why missing ''Joseph''? [[spoiler: The one who's really missing is ''Mrs. Sage''. Might be construed as Mrs. Sage is the one missing Joseph, which prompts her other actions.]]
* ParentWithNewParamour: The reason why Maggie Spence hates Constable Steve.
* QuirkyCurls: Polly Yarkin, though of the darker variety in terms of her "quirks", being obsessed with Steve [[spoiler:to the point of owning a book on herbs to try and make a LovePotion for him.]]
* RantInducingSlight: Lynley's having Havers' flat re-painted without telling her. She doesn't spare any punches, including accusing Lynley of behaving like "the earl patronising the peasants."
* ReallyGetsAround: Steve seems to be doing pretty well in the small social circle of the Lancashire village.
* RedHerring: [[spoiler:Polly Yarkin is set up as incredibly suspicious from the first scene, including having a book on herbs, but she's not the killer.]]
* SideBet: The verdict at Scotland Yard was that there was no way Lynley and Havers' partnership would last more than a month. Alas for them, despite a few hiccups, they're still partners ''seven years later''.
* {{Yandere}}: Polly Yarkin for Steve. The very first scene has her spying on Juliet's house to see if Steve comes by, and she's seen doing it again later. [[spoiler:Doesn't mean she did it.]]
* [[ArtisticLicensePharmacology You Fail Pharmacology Forever]]: Lynley and Havers find it incredibly unlikely that Juliet would mistake wild parsnip for water hemlock considering she's a trained herbalist.
* YoureNotMyFather: Maggie Spence uses almost this exact line to rebuff Steve's attempts at kindness.