Matty -
No, the POW book names names and shows faces! Actually,
An Escaper's Log was Grinnell-Milne's first book. It must have been a smashing success because it was first published in 1926, reprinted in Sep 1926, and again in Oct 1926.
Wind in the Wires came along in 1933. I have the 1968 Doubleday reprint of
Wind in the Wires. This edition is of some additional historical interest because of the forward by
George Vaughn, in which the identities of Johnny S__ and Larry B__ are spelled out.