Mary Burchell

In 2021, investigative journalist Isabel Vincent published Two Against Hitler: The True Story of Two Courageous Sisters, a Rescue Mission in the Third Reich, and Opera, about the Cook sisters. In 2017 producer Donald Rosenfeld discussed plans to make a film of the sisters' humanitarian work and his efforts to unseal CIA files on their activities. The film was to be based on the research by Vincent.

In January 2017 Sunderland Council erected a memorial commemorating the sisters on the site of their childhood home at 37 Croft Avenue, Sunderland.

She ghost-wrote Tito Gobbi's autobiography, My Life and was the subject of This Is Your Life in 1956 when she was surprised by Eamonn Andrews at the BBC Television Theatre.

In 1950 she published her autobiography, We Followed Our Stars. In 2008 it was re-issued, re-edited and expanded as Safe Passage.

Between 1936 and 1985, under the pseudonym Mary Burchell, Ida Cook wrote 112 romance novels for Mills & Boon — many of which were later republished by Harlequin. She helped to found the Romantic Novelists' Association, serving as its second president from 1966 to 1986.

In 1936 Ida published her first romance novels as Mary Burchell. During her career she wrote 112 romances for Mills & Boon, later re-edited by Harlequin Books, including the famous Warrender Saga, a series about the opera and concert-hall world. She incorporated many famous operas (Otello, Eugene Onegin and Carmen, among others) into the Warrender series plots. She wrote in the Romantic Novelists' Association's newsletter:

During the 1930s, as part of the work they undertook to help Jews to escape from the Nazi regime, the sisters visited Germany on multiple occasions, using their genuine enthusiasm for opera as a cover for their frequent travel and smuggled Jewish people's jewellery and other valuables into England, thereby enabling Jews fleeing Germany to satisfy British financial security requirements for immigration. They worked with Austrian conductor Clemens Krauss and his wife, the soprano Viorica Ursuleac, who had initially told them of the persecution of the Jews. The sisters helped 29 people escape, funded mainly by Ida's writing. In 1965 the Cook sisters were honoured as Righteous among the Nations by the Yad Vashem Martyrs and Heroes Remembrance Authority in Israel. In 2010 the British Government named each of them a British Hero of the Holocaust.

Ida Cook (24 August 1904 – 22 December 1986) was a British campaigner for Jewish refugees and a romance novelist as Mary Burchell.

Ida Cook was born on 24 August 1904 in Sunderland, County Durham, England. With her elder sister Mary Louise Cook (1901–1991), she attended The Duchess's Community High School in Alnwick and later took civil service jobs in London. Both Ida and her sister, Louise, developed a passionate interest in opera.

Ida Cook and her sister Mary Louise Cook (1901–1991) rescued Jews from the Nazis during the 1930s. The sisters helped 29 people escape, funded mainly by Ida's writing. In 1965, the Cook sisters were honoured as Righteous among the Nations by the Yad Vashem Martyrs and Heroes Remembrance Authority in Israel.