Soon to retire DI Mavor becomes embroiled in a case involving a series of murders, carried out by the unknown 'Easterman'. On investigation, Mavor discovers that Easterman was the homosexual lover of a man he killed some time before and now he is out for revenge.
Working on a computer project, Martha Fredricks finds herself impeded by colleague Mark Hawkins, who is in secret communication with the computer, taking money from the bank to invest in the currency market. Collecting the interest and replacing the original money, he goes unnoticed, until Fredricks discovers his scheme.