The Deep End

How much does a repressed Lake Tahoe, Calif., soccer mom (”The Beach”’s Tilda Swinton) love her teenage son (”The Virgin Suicides”’ Jonathan Tucker)? Enough to cover up his involvement in the murder of his male lover — and deal with a sleazy blackmailer. Major Sundance buzz about Swinton’s performance (and a cinematography award) could translate into art house success for codirectors Scott McGehee and David Siegel (”Suture”).