"True. Three months' absence from you made his disguise perfect. I'd forgotten just enough. The rotter must have studied ... no, he's an identical twin, isn't he?"
"Right," gritted Cal. "But look, Tinker. This is no place to propose. But why not have me around all the time?"
"Nice idea," said Tinker dreamily. "You'll come along with us on the next expedition, of course?"
"You'll not go," said Cal.
"Now we're at the same old impasse. We've come up against it for three years, Cal."
"But why?"
"Tony and I promised ourselves that we'd solve this mystery before we quit."
Cal snorted. "You've been following in the footsteps of medical men who haven't solved Makin's Disease in the last hundred years. You might never solve it."
"Then you'll have to play my way, Cal."
"You know my opinion on that."