I could only stare.
At last we had a real clue!
In his bungalow, Del Mar at that moment threw down his hat and tore off his mask furiously.
What had he done?
For a long time he sat there, his chin on his hand, gazing fixedly before him, planning to protect himself and revenge.
CHAPTER XVI
THE DISAPPEARING HELMETS
It was early the following morning that, very excited, Elaine and I showed Aunt Josephine the photograph which we had snapped and developed by using Kennedy's trick method.
"But who is it?" asked Aunt Josephine examining the print carefully and seeing nothing but a face masked and with a pair of hands before it, a seal ring on the little finger of one hand.
"Oh, I forgot that you hadn't seen the ring before," explained Elaine. "Why, we knew him at once, in spite of everything, by that seal ring—Mr. Del Mar!"