Complete unknown is Marston's first English language film and centers on Tom and a mysterious woman named Alice. When Tom and his wife host a dinner party to celebrate his birthday, one of their guests brings a date named Alice. Tom is convinced he knows her even though she's going by a different name with a different biography, and she's not acknowledging she knows him.

After nearly four decades together, Ben and George finally tie the knot in an idyllic wedding ceremony in lower Manhattan. But when George loses his job, the couple must sell their apartment and temporarily live apart until they can find an affordable new home. George moves in with two cops who live down stairs while Ben lands in Brooklyn with his nephew, his wife, and their teenage son. While struggling with the pain of separation, they are challenged...