Margaret Sutton 
Trail of the Green Doll [EPUB ebook] 

"Don’t look for it!" The voice startles Judy and Honey as it seems to come out of nowhere. The girls search the area but cannot discover the source of the voice. The strange voice is the first in a series of events drawing Judy into her latest mystery. Judy takes in Helen Riker and her children Penny and Paul as boarders at her home in Dry Brook Hollow. Penny speaks of a green doll but is scolded by her brother. What Judy does hear leads her to believe that some men stole some type of green doll from Mrs. Riker and that it has something to do with their Uncle Paul Riker. Judy and Horace go with the Rikers to visit Uncle Paul, but he has disappeared, his house has burned to the ground, and his entire collection of jade has been stolen. Judy has quite a mystery to solve. She must find the thieves and Uncle Paul and help Mrs. Riker through a difficult time. (Goodreads)