As crosswords editor Tess Harper is poised for a puzzle-solving challenge against the groundbreaking, new supercomputer known as BB, the AI is involved in the death of its creator - the brilliant CEO of XCal Technologies. Tess finds herself swept into the investigation and once again, is at odds with Detective Logan O'Connor. Meanwhile, Chauncey contemplates his retirement and spends some time with Aunt Candace, who helps him think about his options.