📘 Book 8 in the Mary Louise detective series for children created by L. Frank Baum. This book was written by Emma Speed Sampson, writing as Edith Van Dyne. Sampson continued the Mary Louise series of girls' novels after the death of its creator L. Frank Baum. In this book Josie goes to great lengths to find the truth behind two young "orphans'" claim: that their mother is still alive.