Oliver (Archie Madekwe) and Matthew (Théodore Pellerin) in Lurker. (Mubi)Well into Lurker, a gripping melodrama about a sociopathic striver who burrows his way into the clique of a pop star, said striver is stopped on the street. But sandwiched between the awkward flattery is an embarrassing admission: He has no idea what Matthew “does,” exactly. Théodore Pellerin plays Matthew, a retail worker who meets a rising pop star and squirms his way into the celebrity’s inner circle. The pop star and his new barnacle are two very different people aligned in their baseline desire to carve out an identity, any identity, for themselves.