The phrase "a dark episode" is correct and usable in written English.
It can be used to describe a troubling or negative event in someone's life or in a narrative context.
Example: "The novel explores the protagonist's journey through a dark episode that changed her perspective on life."
Alternatives: "a grim chapter" or "a troubling incident".
Those menacing words -- usurpation, judicial fiat -- recalled a dark episode in our recent history.
"In China itself, the famine is a dark episode, one that is not discussed or officially recognized," she writes.
But now there crept in a dark episode, decidedly less glamorous, though spectacular enough, and which must be chronicled in order to appreciate more fully the second chapter of the golden harvest.
Iran's elite revolutionary guards have begun demolishing the Bahá'í cemetery in Shiraz, in the southern province of Fars, which is seen as an attempt to delete a dark episode from the history of mistreating Bahá'ís in the Islamic republic.
Iran's president, Hassan Rouhani, has been silent despite chilling details being revealed by prisoners and their families about how Thursday's disturbances marked a dark episode in one of the country's most notorious prisons.
But Michael Tighe's death was different, because the shots that killed him, and the subsequent cover‑up, were part of a dark episode in the undeclared war in the north, in which it was possible to glimpse the British state fighting terror with terror.
Jack Kerouac wrote The Subterraneans and Tristessa while living here and, in a darker episode, Valerie Solanas was staying in room 214 in 1968, when she became infamous for stalking and then shooting Andy Warhol.
But renewed interest in Miller continues to overlook a darker episode of secrecy and evasion in his past: the story of his 49-year-old son, Daniel, born with Down syndrome.
The decision — which came seven years after the group committed to a cease fire — ended a long, dark episode in Spanish history, a decades-long terror campaign punctuated by brazen daytime machine-gun attacks and the concussive effects of huge car bombs that cost more than 800 lives.
Weirdly, right next door to the shopping centre is the Howff, an atmospheric and ancient cemetery, which makes for a slightly jarring transition when stepping from one to the other: like a very dark episode of Mr Benn.
I'm just guessing, but you have trouble in your heart?" This was a very dark episode – I mean it was actually hard to see what was happening a lot of the time.
