A Dutch publisher stops printing Anne Frank’s Betrayala new book claiming that the young Holocaust victim was likely betrayed by a Jewish Dutchman, the Guardian reports

The Amsterdam publisher Ambo Anthos apologized because he had not been sufficiently ‘critical’ of the thesis of the book.

The book was written by Rosemary Sullivan and published last month in the US by Harper. It tells the story of a team of investigators determined to find out who betrayed Anne, the Dutch girl who was arrested in Amsterdam along with her family and several others after more than two years in hiding. She died in a Nazi concentration camp when she was 15.

The researchers argue that Arnold van den Bergh, a Dutch notary and member of the Amsterdam Jewish Council, told the Nazis where Jewish people in the city were hiding, in an effort to protect his own family.

The claim of the team signed doubt from some historians, who said the evidence was insufficient to draw a definitive conclusion.

CNN reports that Ambo Anthos sent an email to the authors that read: “We are awaiting the researchers’ answers to the questions that have arisen and are delaying the decision to print another run. We sincerely apologize to anyone who may be offended by the book.”

Sullivan and HarperCollins declined to comment on Ambo Anthos’ decision when CNN and the New York Times

Michael Schaub is a Texas-based journalist and a regular contributor to NPR.