The film begins with a remarkably out-of-place scene for a "Charlie Chan" movie: Charlie, his wife, and their thirteen children are gathered around the dinner table, eagerly anticipating the arrival of their first grandchild. While “Pop” – portrayed here by Sidney Toler for the initial time – is occupied elsewhere, No. 2 son "Jimmy" (Victor Sen Yung) finds himself in serious trouble pretending to be his father while …