The phrase "a sinister turn" is correct and usable in written English.
It can be used to describe a situation or narrative that has taken a dark or malevolent direction.
Example: "The story took a sinister turn when the protagonist discovered the hidden truth about their family."
Alternatives: "a dark twist" or "a malevolent shift".
Soon enough, though, things take a sinister turn.
While his presence is initially welcomed, events take a sinister turn.
Over the following weeks, these exchanges started to take a sinister turn.
Things take a sinister turn as it is clear that Thomas is not leaving Downton to visit his ailing father.
But the case takes a sinister turn when the men discover that Holly has a crush on her stepfather.
In Russia, reining in the Witnesses' objections to transfusion has taken a sinister turn, according to religious-freedom campaigners.
He was adored, apparently, by all — with the exception of one man, a physician named Ernst, who appears in this volume wearing a white lab coat over a military uniform, and clutching a sinister turn-of-the-century medical device.
However, as the technology has become more advanced, things have taken a more sinister turn; a couple of months ago a few people reported that their Echo had started laughing at them in a most unsettling fashion, and even supplying, unprompted, lists of local cemeteries and funeral parlours.
MARAWI CITY, Philippines, May 28 (Reuters) - Bodies of what appeared to be executed civilians were found in a ravine outside a besieged Philippine city on Sunday as a six-day occupation by Islamist rebels fending off a military onslaught took a more sinister turn.
Although the prime minister has long had a contentious relationship with the press, some journalists suggested things had taken a more sinister turn at Wednesday's event, saying a hostile crowd bombarded reporters with insults and threatened them with violence.
But in his wake comes a whole new perspective on the series, with Black Flag and Rogue seeing the contemporary side of the story take what might even be a more sinister turn, as Animus-makers Abstergo, a Templar front, move into the entertainment industry to continue their exploration of Miles DNAA.
