What's the Name of That Book??? discussion

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Back to the Titanic
SOLVED: Children's/YA
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SOLVED. Kids go back in time to the Titanic [s]
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It really was - Worldcat search su:Titanic, time travel. Filters: juvenile, fiction. 3 pp of results which is not many.
In the book these kids (I think there was three of them) go to one of their Grandpa's house and discover that he built some kind of time machine. The Grandpa was on the Titanic and wanted to stop it from hitting the iceberg. But the kids end up going back in time instead and have to figure out how to get back home.
I'm sorry if this is really vague but it's all I remember.