There are many ways to kill people especially in Hollywood movies, in this one (which is also known as Murder by Phone) the method of murder is to send sonic death signals and electric shocks down the line. When one of his former students is killed in this grisly manner, Nat Bridger (Richard Chamberlain) heads into the city to try and find out what exactly is going on. A man with a grudge (Robin Gammell) is carrying out these killings, the telephone company isn't really helping much by using it's huge corporate power and influence to bury the problem.
Nat, with the help of Ridley (Sara Botsford) and the police (Gary Reineke), begins to unravel the plot and the cover-up. The film is full of tension and suspense especially in the final act as Nat challenges the killer to call him so his location can be traced.
A fantastic film but one which will probably leave you with an irrational fear of the telephone. Luckily nobody speaks on the phone anymore and nobody has worked out a way to kill people using SMS or Twitter... yet.