Dial M for Murder

There is a killer on the loose and he is rampantly murdering anyone who uses a particular phone booth on a highway. Two small time crooks who swindle a man get killed unexpectedly and a couple Roy & Jiyaa who use the phone booth for a prank call are threatened. Next morning, Roy's girlfriend Jiyaa is found murdered. Roy blames this on the phone-call. The cops get called in to solve the mystery.

Will they be able to connect the dots and nab the killer before he makes his next move. To know how the cops solve this case