“___ for Innocent” (Sue Grafton novel)

The answer to the crossword question “‘___ for Innocent’ (Sue Grafton novel) is IIS” is the letter combination IIS. This refers to the title of a book in the Kinsey Millhone Alphabet Mystery series by Sue Grafton. The series features a private detective named Kinsey Millhone, with each title corresponding to a letter of the alphabet. “I is for Innocent” is the ninth book in the series and was published in 1992. The series has been critically acclaimed and has a dedicated following of fans who eagerly await each new installment.