In addition to cobwebs and piles of dead insects, what Lucy, Barry, and Harry found inside the playhouse is: piles of books and that time was altered.
"Singularity" is a science fiction novel that was written by William Sleator. The novel tells the story of twins, Barry and Harry who went to visit their dead uncle's house and discovered a playhouse. The playhouse was mysterious.
When they examined the playhouse, they discovered piles of books and also discovered that time was distorted inside the playhouse.
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