Murder on the Aisle

Tobin, a five-foot-five, red-headed film critic — co-presenter of a syndicated movie-review TV show — is in trouble. He’s been found kneeling over the body of his dead partner, fingering the knife that’s sticking out of the dead man’s back, and it’s clear that the police are not going to look for any other suspects. Not when it’s Christmas. Not when they know that Tobin has been having an affair with his partner’s wife. Not when Tobin and his partner had been involved in an on-camera free-for-all just moments before the murder.
Tobin didn’t kill bis partner — but will anyone believe him? Did anyone else have such clear motive? Did anyone else have the opportunity? Do Siskel and Ebert ever have problems like this?