'Dert and Do' is a heart-warming tale of the friendship that develops between a bachelor and two children. Harry, the bachelor, really adores children even though he can't seem to get a wife to marry, instead wishing that his late mother had found him one before she passed away. But the young man's desire may yet be realized when he rents a room in a cottage owned by Mrs. Heath who lives with her two children Dert and Do.