who is the killer in the book ordeal by innocence
Ordeal by Innocence The killer is revealed to be Kirsten Lindstrom, the Argyles' middle-aged housekeeper. Jacko had persuaded the plain Kirsten that he was in love with her, and persuaded her to murder his adoptive mother under cover of a "foolproof" alibi to steal some much needed money. But once Kirsten learned that Jacko was secretly married, she decided not to cover for Jacko, abandoning him to his fate.