Rice, who describes herself as "one of New Zealand's most successful mediation and litigation lawyers" accused Queen's Counsel David Heaney and lawyer Susan Thodey of breaching duties they owed her.
All three were partners at Heaney & Co, which reportedly took in more than $30 million in fees when defending the Auckland region's councils in leaky building disputes. Rice had worked at the firm for more than a decade when Heaney allegedly terminated the partnership in May 2013.
Rice alleges that he then made contact with clients of the firm telling them she would no longer be a partner of it.
A new partnership was formed the following month by Heaney and Thodey called Heaney & Partners.
It was based in the same offices as the old firm, employed the same staff and had mostly the same clients.
Rice claims that as a partner of Heaney & Co she enjoyed certain rights and that Heaney and Thodey breached their duties to her by approaching clients and staff and taking control of the firm's assets.
She said the new firm was in all material aspects the same as the old, just without her. She also claimed to have suffered loss while Heaney and Thodey have enjoyed a similar income to previously.
Rice, who has since established her own firm, launched action against them in the High Court but the parties cut a deal just as the proceedings were due to be heard.