As eccentric as its cast, it is likely that the entry will appeal to a much narrower audience than mainstream drama—moreso because its value seems to be more heavily drawn from the absurdity of the events and characters than comedic wit.
The quality of the writing is for the most part effective. Paragraph and sentence length are varied to suit the level of tension—comedic or otherwise—befitting the situation. (One such case that stood out to me was thus: «I then proceeded to throw my entire plate of chocolate balls into his face. Getting him, his suit, and his acute sense of cleanliness all covered in chocolate.» Grammatically speaking, both sentences should have been fused into one, as the second lacks a defined subject. Splitting them, however, allows the first sentence to be more punchy as demanded by the suddenness of the action it describes, without depriving the reader of the juicy details elaborated upon in the second sentence.)
Three nuisances came to light—whether or not they were endemic is hard to say for a story as short as this.
First, the dialogue was often presumptuous. Emily had something to say about David, so of course Simon mentioned that exact thing. Simon knew Chandler disliked that chocolate thing, giving him every reason not to go, and yet Simon asks if he's going anyways. For an entry built largely on character interaction, having the dialogue flow more naturally out of clear hints and deductions would be a great boon.
Secondly, the exposition regarding the Murphy family was presented at the end of a dialogue chain, after the subject had already moved on. Interjecting it amidst the dialogue earlier would have helped keep the flow by keeping things on topic, instead of forcing the reader into a double-take.
Thirdly, there was a lot of confusion in regards to the execution of the plan. They stated it would take a half hour, the time that passed was described as thirty minutes, but it took them fifty-five to finish and Chandler was supposed to return in sixty. Also, there was no indication as to how Betsy's meddling with the children accomplished anything, nor that Mrs Murphy had been summoned by her, as Simon claimed, instead of by Chandler's cries of foul play—see presumptuous dialogue above.
(Also, having «SHH» in the dialogue after the narration had already described his «shush»ing is redundant. Very minor thing.)
On a more general note, there didn't seem to be any significant character development in the progression of the narrative, which is often highly important in character-driven stories. While Simon's calming of Chandler could be conceived as such, the fact that he was also able to do so easily at the start of the story hampers its significance.
Overall, a fun but flighty entry, with good writing besides.