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After last week’s epic crossover between “Magnum P.I.” and “Hawaii Five-0” where Thomas Magnum (Jay Hernandez) and his friends helped Five-0 save one of their own, this week’s episode has Magnum and his partner Higgins (Perdita Weeks) back to business as usual. In the episode “Mondays are for Murder,” Higgins asks TC (Stephen Hill) to cover for her on their most recent case. She has a shoulder injury that keeps her from going undercover with Magnum as efficiency experts to find out if a corporate manager in a sunscreen company has been murdered.