Spare Change is a crime novel by Robert B. Parker, the sixth and final novel in his Sunny Randall series published before his death.

The killer's MO is to shoot the person in the head, and leave three coins at the scene of the crime, hence the name Spare Change.

Spare Change sent numerous letters to Phil during the original crime spree, but then the killings abruptly stopped, until now.

They take down all of their information, and later bring them to the station and question them one by one; their hope being that the killer would have hung around the crime scene to watch.

While investigating at Bob's alma mater, she also discovers that his father was a professor there and had a fatal heart attack in his office.

Sunny follows up by interviewing the police officer at the scene who reluctantly confirms that it was in fact a suicide.

The college president had insisted on reporting it as a heart attack to prevent a scandal the school couldn't afford.

Later Sunny breaks into Bob's apartment and while searching his address book, finds the name Chico Zarilla.

During the stand-off, Bob is so intent on Phil that he doesn't notice Sunny draw her weapon.

His parents are dead; the only woman he ever loved is with another man, so he feels that Chico Zarilla is all he has left.

The women of course refuse and the men insist, and just when it looks like they may be raped Sunny knees Julie's boyfriend in the crotch and draws her weapon.