This 1986 spy thriller is a realistic thriller. Michael Caine gives a great performance as Frank, the father of a son that has died during mysterious circumstances. Frank embarks on his own investigation into his son´s death only to discover a British society that not is what it seems to be, under the surface. His investigation leads to the government and what they would do to protect it´s secret activities. The whistle blower is told in a slow yet thrilling pace. The plot is good, even though it is hard to follow from time to time, and the acting great. The production is very simple which makes the film realistic. The whistle blower is one of Caine´s better spy thrillers and is recommended for anyone into the spy genre. 7/10