This is a story about money and marriage on Wall Street — one about a fugitive, a billionaire, an ex-wife and her lawsuit.

It begins happily enough, 30 years ago this month, when a Wall Street trader named Steven A. Cohen married his sweetheart, Patricia Finke.

Today, Mr. Cohen is among the world’s richest hedge fund managers, with a $6 billion fortune. And Ms. Cohen, whom he divorced long ago, is leveling some startling accusations.

In a lawsuit filed Wednesday, Ms. Cohen claims her ex-husband hid millions of dollars from her — a common enough complaint as big-money divorces go.

But here the story takes an odd turn. Some of those millions, Ms. Cohen claims in her suit, were reaped through insider trading in the 1980s.

And to hide his millions, the complaint asserts, Mr. Cohen funneled money through a New York real estate operator who was later convicted on fraud charges and then fled to Costa Rica, where he was eventually tracked down.

Read More: – By Jenny Anderson and Zachery Kouwe, The New York Times