Harold Peerenboom is rich and resourceful — and has a peculiar way of settling scores.

The 70-year-old Toronto millionaire, who founded one of the top executive search firms in Canada, has never shied away from a scrap. While he has undoubtedly made enemies, even those who have locked horns with him grudgingly admit that he fights with flair and imagination.

There was the time he shone a blinding light into the bedroom of one of his neighbours over a backyard dispute. Or the time he allegedly threatened to build a pig farm next door to a ski club that wouldn't accept his family as members.

Peerenboom's feuds have ranged from the petty to the political, but the one he's waging at his posh condominium complex in Palm Beach, Fla., is a new level of bizarre. The case has stretched on for years and involves an eclectic cast of characters, including the CEO of Marvel Entertainment, high-profile lawyers tied to U.S. President Donald Trump, the Department of Homeland Security, the U.S. Postal Service, Palm Beach detectives and Toronto police.

Both sides have enlisted high-profile lawyers and public relations firms. Peerenboom, for example, has hired PR guru Sallie Hofmeister, who is also representing disgraced Hollywood producer Harvey Weinstein over multiple sexual harassment and assault allegations.

The details are outlandish and hinge on a campaign of vicious allegations about Peerenboom contained in letters sent to fellow residents of the condo complex as well as to Peerenboom's friends, family members and work colleagues in Toronto.

"Once he has decided he's going to pursue a certain path, there's no stopping him."

If you believe Peerenboom, the hate mail campaign stems from a disagreement over a tennis court and can be traced back to fellow condo residents Isaac "Ike" Perlmutter and his wife, Laura, both of whom he has named in a lawsuit.

For all his past bravado, it's possible that this time, Peerenboom has met his match. Ike Perlmutter, 74, is a formidable foe — the reclusive U.S. billionaire is the CEO of Marvel Entertainment and a personal friend of Donald Trump. The powerful Perlmutters not only deny the accusations but have launched a countersuit accusing Peerenboom of stealing their DNA, of all things.

That Peerenboom might go to such extreme lengths to defend his principles is unsurprising to those who have tussled with him before.

"With Harold, in my experience, anything is possible," said John Adams, a former Toronto city councillor who inadvertently became Peerenboom's target when he tried to arbitrate a dispute between him and his neighbour.

Harold Peerenboom avoids the press, and photos of him are hard to find. This one appears on the website of his headhunting firm, Mandrake. (Mandrake) Harold Peerenboom avoids the press, and photos of him are hard to find. This one appears on the website of his headhunting firm, Mandrake. (Mandrake)

Adams's brush with the millionaire taught him that Peerenboom can be "very creative" and "would leave no stone unturned in advancing his side of the case."

Which is why Peerenboom has shown no signs of relenting in his six-year fight with Perlmutter.

Peerenboom turned down requests for an interview with CBC News. When this reporter knocked on the door of his mansion in north Toronto, Peerenboom would only respond through his intercom system: "I don't speak with the press, but I appreciate you dropping by."

Those who know Peerenboom say that like many of his skirmishes, the Palm Beach dispute is really about his sense of justice and need to right a perceived wrong.

"Once he has decided he's going to pursue a certain path, there's no stopping him," said former Conservative cabinet minister Lisa Raitt, who has known Peerenboom for years. "Time does not stop him. Distance does not stop him. Space does not stop him. He will continue on the path that he chooses until he gets a result."