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It was a dark and foggy night when mrs. Johnson， a wealthy widow， realized that her most prized possession， a diamond necklace passed down for generations， was missing. She immediately informed the police and they arrived at her estate to investigate the theft.

detective Smith， a renowned investigator， was assigned to the case. he questioned everyone in the house， including the butler， the cook， the gardener， and mrs. Johnson's two nieces， who were the only guests in the mansion that night. however， none of them had any clue about the missing necklace.

the detective then turned his attention to the security footage from the night before. he carefully reviewed the footage and noticed a masked figure walking around the mansion. the footage was too blurry to make out any details， but it gave him an idea.

he interrogated the nieces again and discovered that one of them had left the house for a couple of hours during the night， claiming that she had a headache and needed fresh air. the detective found this suspicious and started investigating her further.

As he dug deeper， he found out that the niece in question， Anna， was heavily in debt and had been borrowing money from loan sharks. the detective assumed that she must have stolen the necklace to pay off her debts.

when he confronted her， she initially denied any involvement but later confessed. She had found out about the necklace and planned the robbery. however， she had worn a mask to avoid getting caught on the security camera.

the necklace was eventually recovered and returned to mrs. Johnson. Anna was arrested and sent to prison for her crime.

the case was solved， but the detective couldn't shake off a feeling of unease. what if there was someone else involved in the theft? were there any other secrets hidden in that mansion? the mystery remained unsolved， but detective Smith knew that the truth would eventually e out.