bookseekinmommy
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About 15 years ago or more, I read a science fiction novel that I am desperately trying to find. It was in seventh or eighth grade, and mostly about time travel. Twin boys (17 I think) went to live with their grandfather, and discovered a shed in which time was accelerated. It was also a portal to another world, where weird creatures would sometimes come through. One of the twins decided to age himself one year ahead, so he wouldn't be a twin anymore. The author's last name may have begun with A or B, but I'm not sure. Any help you can give me is greatly appreciated! Thanks!