"X-Men" star Famke Janssen could've used some super powers last weekend, as a prowler broke into her apartment and left a bizarre keepsake, according to published reports Tuesday.

Janssen, 47, returned to her King Street apartment around 8 p.m. Saturday night and found the children's book "The Lonely Doll" in her bedroom -- a book she says she doesn't own, according to TMZ.com. Nothing appeared to be missing from her home, reports said, and no one but Janssen has access to it.

After seeing the book Janssen filed a police report. Officials are reportedly poring over surveillance footage and investigating the case as a burglary. There were no signs of forced entry, reports said.

"The Lonely Doll," written and illustrated by Dare Wright and first published in 1957, tells the story of a doll and her two bear playmates.

Janssen's rep didn't respond to a request for comment.

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