"Suspicion" is a short story by Dorothy L. Sayers in which a man named Mr. Mummery suspects that the household cook has plans to poison both his wife and himself. He is surprised to find at the end that his suspicion has been inaccurately placed.

Mr. Mummery fights back a nagging sense of indigestion as he makes his way to work. It is not his breakfast that is the offensive element, as it was his usual meal and the one that the health experts recommend. Their new cook, Mrs. Sutton, who had been with his wife Ethel and himself just a short while, knows how to prepare his meals perfectly.

Mr. Mummery is grateful that they found Mrs. Sutton after the abrupt departure of their last cook because Ethel experienced a nervous breakdown last summer and could not stand any more disruption to their lives...