While on a summer trip with her friends, Megan begins to feel the presence of Sophie, her twin sister who recently committed suicide.
| Actor | Role |
|---|---|
 Elisabeth HarnoisMegan / Sophie | Megan / Sophie |
 Shawn AshmoreChristian | Christian |
 Amanda SeyfriedZoe | Zoe |
 Hilarie Burton MorganAlicia | Alicia |
 Tyler HoechlinNick | Nick |
 Matt O'LearyMark | Mark |
 Lisa ArnoldMrs. Thomas | Mrs. Thomas |
 R. Lee ErmeyLeonard | Leonard |
 Lyle BrocatoPartier | Partier |
 David DahlgrenMr. Thomas | Mr. Thomas |
 Jenna HildebrandMalin (as Jenna Lynn Hildebrand) | Malin (as Jenna Lynn Hildebrand) |
| MMark KrasnoffCop | Cop |