They had gone to a lot of trouble. They had Mason’s private number, woke him up and
 persuaded him to meet them at his office in the middle of the night. There he found
 a man and a girl; a man who knew exactly what he wanted but wouldn’t explain; a girl
 who wore a man’s overcoat, a mask — and wouldn’t speak. It was the girl who kept
 the other half of the ten-grand note. When and if they needed Perry Mason he’d 
get her half. Not until then would he know who his client was. Perry suspected 
he was being played for a sucker, but he was too interested to swim away.The next
 morning, he felt the hook. It was murder, a murder obviously linked to his 
mysterious visitors. And the barb on the hook was that Perry couldn’t discover
 who his client was or what he was supposed to do. Della Street’s mocking jibes
 were hard to take.A racing Gardner story full of action, suspense and one of 
the most original plots Gardner has ever created.
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