He interviewed former Nazi criminals successfully living in Western Germany, e.g. Hans Fleischhacker, Heinz Reinefarth, the subsequent editions of his book Company u pana słychać? were published in 1975,1978,1981. His criminal novel Zbrodniarz, który ukradł zbrodnię was filmed in 1969 and the result was one of the best Polish movies, starring Zygmunt Hübner and Barbara Brylska.
Kąkolewski wrote a book about Communist propaganda novel Ashes and Diamonds by Jerzy Andrzejewski.
He wrote also a book about Communist anti-Semitism in Kielce region, including his opinion about the Kielce pogrom.