Heart on a String — Lois Carnell Alexander

Fun-loving puppeteer Adrienne Madill is graduating from Arkansas University. With her Aunt Maida's help, Adrienne has successfully put herself through college conducting puppet shows for children and plans to turn the sidework into a full-time career.
Adrienne meets guest speaker Dr. Gerald Rowland at the ceremony, accidentally spewing him with water from a drinking fountain. Stifling her laughter, she backs off, later to realize that he is the aeronautical engineer she wrote for advice on her planned aerospace puppet show.
The two meet again in the century old Crescent Hotel in the Ozark Mountains. Gerald is conducting a seminar and Adrienne is hired to entertain the children and guests of the hotel for the summer. To her further surprise he remembers her inquiry and the drinking fountain incident. Soon, their hearts become entwined and their emotions become confused like tangled marionette strings, until all is settled happily.