The Missing Formula

Madge Sterling's new friend, Anne Fairaday, has recently lost her father. Anne may also soon lose her home since the house is mortgaged, and she has very little money left. Anne's only hope is to find her father's valuable secret formula for a substance that will keep metal from rusting. Mr. Fairaday hid the formula to prevent theft, only he never told Anne the location of the hiding place.

Madge helps Anne search for the formula with no success. Anne does have a few meagre clues which lead Madge to suspect that a certain book may hold the secret. However, nothing can be found inside the book. Complicating matters, Mr. Fairaday's former assistant snoops around the Fairaday property in an attempt to locate the formula for himself. Madge and Anne continue their search, hoping to locate the formula before it lands in the wrong hands.