An extraordinary human document -- first hand evidence out of Hitler's Germany, in the diary of a Munich journalist held in ""protective custody"" as a political prisoner, without trial, without justification. Just the bare bones of fact are here -- the diary was kept secretly, on any scraps of paper, and smuggled out of the prison. But through these ""bare bones"" the incredible picture of injustice, frequent cruelty, inhumanity comes through. If this had come earlier in the Hitler regime, while indignation was at white heat, it would have been sure of a sensational success. Coming now, after the publication of numerous accounts, factual and fictionized, its success depends on the breaks of the press. With so little important non-fiction scheduled for summer, it should get -- and deserves to get -- a good break. The substance is there -- the elements of a popular success -- the angle is a fresh one and not unduly bitter and violent. Watch it. You are safe in expecting a reasonable sale among intelligent readers interested in current social and political problems. You may get more.