In many aspects, 'The Iceman' is true. It draws inspiration from actual cases and characters, but some artistic liberties might have been taken for dramatic effect.
To make retro comics, first, research classic comic artists and their techniques. Then, focus on creating characters with distinct, simple designs. Also, choose a limited color palette that was popular in the past.
I haven't read this novel specifically, but generally, it might be about a character known as the iceman. Maybe it tells the story of his life, his challenges, or his unique abilities related to ice in some way.
The main characters could include the iceman, of course. Then perhaps there's a female character who serves as his love interest. She might be someone who is initially not aware of his true nature but gradually gets involved in his world. There could also be a villain, a powerful and evil character who wants to use the iceman's powers for his own dark purposes or simply wants to destroy the iceman. These three types of characters - the hero, the love interest, and the villain - are common in many novels and could very well be the main characters in 'the iceman novel'.
The story of who killed the iceman is full of intrigue. There are multiple possible culprits and clues, but the truth is elusive. It's a case that keeps readers guessing until the very end.