hello i need atitle of an early 80s british who done it. at first i thought david wagner was an actor in it. but his bio doesnt have it listed. its about two brothers one is in a wheelchair both wealthy. theres a womans dead body in the trunk of one of the brothers cars.the entire movie takes place at the handicapped brothers house. i recall a violent fight at the end of the movie between the two brothers. one of the brothers uses a crossbow to shoot the other. the viewer has no idea which brother killed the woman till the movies almost over. i rented on vhs around 1987 or 88 from a little no name video store. thank you