Night and Day is a crime novel by Robert B. Parker, the eighth in his Jesse Stone series.

Night and Day begins with the investigation of a middle school principal accused of molestation.

Several girls accuse Principal Betsy Ingersoll of making them pull their dresses up so she can see their panties.

He has Suit talk to two of the women, one of whom he knew in high school, to get more information on the swingers club.

The Night Hawk starts as a peeping tom, and the Paradise police get several calls about him.

Jesse discovers that Ralston's wife used to teach a Wednesday night class, which corresponds with all the peeping tom reports.

He also discovers that the peeping tom reports stopped at the same time that Ralston’s wife quit her teaching job to begin doing her doctoral work full-time.

Meanwhile, Jesse continues to pressure Betsy Ingersoll, who then reports that she is a victim of the Night Hawk.

She was acting out because her husband cheats on her constantly with young women, which also explains her obsession with teenage girls not growing up to be sluts.

They begin searching for him, and soon after Jesse receives another letter from the Night Hawk blasting him for speaking with his wife, and ruining his life.

Molly waits at home with a gun strapped to her thigh, and a wire so Jesse can hear her.

Jenn takes a job on a syndicated news program in New York, and moves in with the producer in Manhattan.