About the book: year / From the collection "Thirteen Mysterious Cases". Sir Henry's Story. Three people, a married couple and the wife's companion, sit down to dinner. After dinner, everyone feels unwell, but in the end the wife dies. The cause of death was poisoning with ptomaine contained in canned food served for dinner. The maid's testimony indicates that the husband wanted his wife dead. The police exhume the body and determine that death was caused by arsenic poisoning. The investigation reaches a dead end: the husband had a motive, but did not have the opportunity to commit a crime; the companion had the opportunity, but had no motive.