When Season 4 starts, it is discovered that Peyton has a half-brother named Derek and from there it gets
complicated. Mostly because Lucas over time gets paranoid about Derek and has hunches that something isn't right. This leads him to find a girl in a hospital with a wig and outfit that is identical to Peyton and the missing dyaket from Tric that is Ellie's. Lucas further investigates causing a slight tiff with Peyton over how paranoid he is, but this leads to him being right; her brother wasn't her brother, but an imposter who was obssessed with her from her podcasts. But her real brother...
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