The phrase "a mysterious case" is correct and usable in written English.
You can use it when referring to a situation or event that is puzzling or difficult to understand, often in contexts like crime, investigation, or intrigue.
Example: "The detective was called to investigate a mysterious case that had baffled the local police for weeks."
Alternatives: "an enigmatic situation" or "a puzzling matter."
Susan Dominus recently wrote for the magazine about dieting in France, a mysterious case of twitching teens and the woman who took the fall for JPMorgan Chase.
The development is the latest twist in a mysterious case that has proved elusive to investigators on both sides of the Channel.
Its presence coincides with a mysterious case of white vegetables, causing the family's cat, Chester (the excellent Prescott Seymour), and dog, Harold Robert Anthony Joness), to face off over whether Bunnicula is actually a vampire bunny.
In addition to covering a mysterious case of dead birds dropping from the sky and the financial complications prompted by a bridge closure, McBride was one of the reporters following Oklahoma's plans to execute two death-row inmates, on the same night, by lethal injection.
It was one of the episodes in which Alicia was mostly in the background, but a major plot line that's coming up did click into place: out of nowhere — as far as I can remember, but correct me if I'm wrong — we found out that Will had been preparing to defend Kalinda in a mysterious case involving taxes, and that now Alicia will have to take it over.
Officials at Los Alamos National Laboratory announced today that they are investigating a mysterious case of beryllium contamination.
But Cuba is a surprising and mysterious case, because such a small island that's rather unfortunate in every way has, in each generation, produced very good poets, novelists, and short-story writers.
NATIONAL A map of Missouri on Monday with an article about the mysterious case of a Labrador retriever that had been placed in quarantine in Salem, Mo., after being accused of biting a girl and then later disappeared included an erroneous mileage scale.
The weirdest thing in this book is probably "The Mysterious Case of Mystery Mountain," starring his female Li'l Abner knockoff, "Babe".
First, northward (hurrah!) to The Bridge, returning to fill BBC4's Saturday-night subtitled slot (recently vacated by Borgen), with Swedish-Danish duo Saga and Martin teaming up to investigate the mysterious case of a ship found adrift with no crew and a bunch of abducted young Copenhageners in chains below decks, dying (as it turned out) of the plague.
William Whitaker of the Abilene Reporter-News gave the film a negative review, stating, "where I was expecting a dramatic retelling of the mysterious case concerning the phantom killer and his bizarre murders, I was greeted with an extremely uneven picture, collapsing into the most sickening, blood-weltering scenes one minute and then lapsing into some incredibly bad comedy relief the next".
