Too honest

     "Too simple," Pam North said. "The too-perfect murder."

    "As you said," Bill agreed. "But you see - you don't have to be right, Pam. I do, in the end. That's the catch. I can't just say 'too perfect' and close my eyes." He nodded, slowly. "Nine to one," he said, "It was Peggy Mott. Only - "

    "Only the one," Pam said. "Your trouble is, you're honest." She looked at Dorian. "Isn't he?" Dorian said, lightly, "An inconvenience, sometimes."

(from Murder Is Served, by Richard and Frances Lockridge)