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Lehane says he'll name a character in his next book after whoever finds Tessa, who disappeared from the family's home in Brookline, Mass., this week.

He says on his Facebook page that Tessa jumped a fence at the home, and even though she has been micro-chipped, she was not wearing her tags.

Lehane says Tessa is "smart, fast, and immeasurably sweet."

Lehane wrote "Mystic River," "Gone Baby Gone," "Shutter Island" and other books.