Who is the uninvited? This twisty page-turner from a master of suspense plumbs the unsettling goings-on at a picture-perfect woodland cottage. Mimi Shapiro had a disturbing freshman year at NYU, thanks to a foolish affair with a professor who still haunts her caller ID. So when her artist father, Marc, offers the use of his remote Canadian cottage, she's glad to hop in her Mini Cooper and drive up north. The house is fairy-tale quaint, and the key is hidden right where her dad said it would be, so she's shocked to find someone already living there - Jay, a young musician, who is equally startled to meet Mimi and immediately accuses her of leaving strange and threatening tokens inside: a dead bird, a snakeskin, a cricket sound track embedded in his latest composition. But Mimi has