There ought to be awards for best supporting apps as Siri, Taskrabbit, Google, Instagram, YouTube and many of their cyber companions become utility players in Nick Johnson and Will Merrick’s computer screen mystery thriller Missing (B). This standalone sequel to Searching follows a teenager (Storm Reid) who wields various technologies to find her missing mother (Nia Long) after she disappears on vacation in Colombia with her new boyfriend (Ken Leung). Reid is effective in the central role and lots of fun opposite Joaquim de Almeida as a deputized detective of the gig economy. The format popularized during the pandemic shows some signs of strain at first, but the co-directors weave an impressive and nail-biting narrative as the intrepid teen endeavors further down the linked looking glass. Film flourishes including webcams and cracking codes keep the action less desk-bound. Ultimately the successful story transcends the form and trumps initial trepidation about the story-told-on-a-synced-desktop trope.