The Time Travelers were back in their science lab, discussing their next adventure. They had just returned from their incredible journey through time and were eager to see what else they could discover.

As they were brainstorming ideas, they heard a loud knock on the door. It was their neighbor, Mrs. Jenkins, who was known for her love of mysteries. She had a perplexed look on her face and asked the friends for their help.

Mrs. Jenkins explained that her prized possession, a valuable diamond necklace, had gone missing. She suspected that it had been stolen and asked the Time Travelers if they could use their scientific knowledge to help solve the mystery.

Excited for a new challenge, the friends accepted the task and got to work. They used their time machine to travel back to the day of the theft and observed the events leading up to it. They noticed a suspicious figure lurking around Mrs. Jenkins' house and followed them to a nearby alley.

Using their scientific tools, the Time Travelers were able to gather evidence and piece together the clues. They discovered that the thief was actually Mrs. Jenkins' own butler, who had been in desperate need of money.

With the help of the Time Travelers, Mrs. Jenkins was able to retrieve her necklace and the butler was brought to justice. The friends were praised for their detective skills and were even featured in the local newspaper.

As they returned to the present day, the Time Travelers were proud of their accomplishment. They had not only solved a mystery, but they had also helped someone in need. And with their scientific knowledge and sense of adventure, there was no telling what other mysteries they could solve in the future. The end.