Here are some examples of mystery stories featuring strange occurrences with culprits and motives:

The Circleville Letters case is a real-life mystery that involves a series of threatening anonymous letters sent to residents of Circleville, Ohio starting in 19771. The letters contained personal information about the recipients and made wild accusations. Despite police involvement, the identity and motives of the letter writer were never uncovered, making this a creepy unsolved mystery.

In fiction, Agatha Christie's "Murder on the Orient Express" features the strange occurrence of a murder in a locked train car, with multiple suspects who all seem to have alibis. The culprit and motive are revealed in a surprising twist ending.

"The Hound of the Baskervilles" by Arthur Conan Doyle involves the seemingly supernatural death of Sir Charles Baskerville, attributed to a demonic hound. Sherlock Holmes must use his deductive skills to uncover the true culprit and motive behind the strange events4.

The film "The Usual Suspects" centers on a mysterious crime lord named Keyser Söze and a heist gone wrong. The strange occurrences and unreliable narration keep viewers guessing about the true culprit and motives until the very end4.

In "And Then There Were None" by Agatha Christie, ten strangers are lured to an isolated island and start dying one by one in accordance with a nursery rhyme. The strange deaths and isolation create an atmosphere of paranoia as the characters try to determine the culprit and motive.

These examples showcase how mysteries can use strange occurrences to build suspense and intrigue, while ultimately revealing a culprit with comprehensible (if sometimes twisted) motives behind their actions. The combination of bizarre events and logical explanations is part of what makes the mystery genre so compelling.