Nobody in the Rigi family is really looking forward to the Christmas Child this year. 13-year-old Sima and her little brother Elyas know: Mom Leonie and dad Kian are going to split up! Even Kian's parents Britta and Navid, who want to spread Christmas cheer, can't turn the tide. Only after a false alarm about Elyas, who has suddenly disappeared, do the tensions ease. The newlyweds make a discovery on their doorstep: a baby just a few weeks old. After a confession from him, the search begins for the mother - and the reason why the foundling should be with parents who are separating.