English teacher Sarah Deane and her Aunt Julia join a garden tour of England, France and Italy. For Sarah, one of the attractions is the opportunity to connect with her old friend Ellen Trevino, who is to lead the tour. But Ellen doesn't make the plane, and Sarah's husband Alex learns that Ellen's been murdered. When mysterious events occur around here, Sarah is sure that they are connected to Ellen's death. But who is behind what's happening, and why is there a mysterious woman who resembles Sarah's mother-in-law haunting the group?