Chapter Fifteen through Eighteen Summary

Alex arrives home after work and discovers that Mike is already at her apartment, waiting for Alex and talking to her doorman. Alex and Mike go upstairs and Mike says that he has photos people took on the ferry to Martha's Vineyard on the day Isabella made the trip. Among the photo is a series of shots of Isabella, apparently taken by someone who recognized Isabella and was making a nuisance of himself. There isn't a clear shot of the man who was with Isabella, but there is a photo of the man's arm as he evidently tries to make the photographer stop. Mike is flippant, saying that it will be impossible to identify the man from just his hand and the sleeve of his shirt. However, Alex immediately realizes that the arm, as well as the...