There is much to be commended in this book: a decision to popularize the podvig (Russian for "spiritual feat") of Pvt. Ivan Moiseev, a decently-written narrative, inclusion of various documents and their English translations in an appendix. But I can only grant "Vanya" one star according to the Goodreads system ("didn't like it"): Grant lets her imagination roam far too far from the bare truth for my taste, embellishing Vanya's real-life suffering and eventual martyrdom with sketched-in digressions about the daily life and, even more egregiously, the inner thoughts of various personages, all of them rooted in Western stereotypes of "Sovietness". Alas, in trying to make Ivan's witness accessible, Grant has instead turned it into a paperback page-turner. This would be acceptable, if only the cover clearly stated "based on a true story". But it doesn't. Those readers untrained in close textual analysis are left believing that details of army officials' home lives are just as faithfully conveyed as the actual facts of Vanya's life and death.
God loves Lt. Col. Malsin just as much as he loves Ivan Moiseev. Full stop. Given that the events described in Grant's book occurred forty years ago, it is quite possible that Moiseev's various torturers are dead. I don't think it's fair to put any thoughts, especially evil ones, even into a dead man's head for the sake of emotional "truth", for the sake of narrative accessibility. In my opinion, such dramatization cheapens an uplifting, and more importantly, a true story.
I would suggest reading this book, but only Part II, wherein Vanya and actual, historical documents are allowed to speak for themselves. And if Vanya Moiseev touches your heart, I suggest checking out "Fr. Arseny: Priest, Prisoner, and Spiritual Father", published in part by St. Vladimir's Seminary Press. The witness of Soviet Christians is at once beautiful and painfully humbling. Would that our Lord give us all the strength to call on His holy Name, even unto death.