Download or read book Thora and the Green Sea-Unicorn written by and published by Harper Collins. This book was released on 2007-05 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: When an attempt to steal Shirley, a rare sea-unicorn, results in the sinking of their houseboat, ten-year-old Thora, her mermaid mother, and Mr. Walters stay at the estate of old friends and find a solution to the friends' financial troubles, but the would-be thief is still on their trail.