Fig. 1.

– Geographic profile of the Mr. Cruel Case in Melbourne, Australia. The red pins represent the abduction/attack sites of his four victims, with the red circle and red polygon highlighting a small portion of Mr Cruel's activity space using the circle theory and convex hull methods respectively.1 The green pins represent the release/deposition sites, with the green circle and green polygon encompassing Mr Cruel's activity space using the circle theory and convex hull methods, respectively. The yellow pins and circles represent two important areas to the case. The yellow circle and pin inside the large green circle denote a highly likely area for Mr. Cruel to have lived (Burwood), with the yellow pin and circle in the top left which includes five neighbourhoods that Mr. Cruel may have taken two of his victims to, as it is close to the Melbourne airport (yellow pin in top left), and two victims recounted hearing planes overhead in their witness accounts [44]. This profile would benefit the police investigation, as it demonstrates the most likely areas to search (the red and green convex hulls), which could generate new leads and potentially apprehend the person responsible. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)