London, Grant Richards, 1936. First edition, first impression. Hardback. A very good copy in a good jacket. Inscribed by the author. An uncommon SF, the titular crisis being another planet encroaching on our turf. Preface by M.P. Shiel. I haven't seen a copy in jacket before. That said, the jacket has been patched up in a not-so-pleasant manner. Basically taped and backed, in places. The book is a little dusty along the top edge with some foxing and toning internally. Small owner's inscription. [10096, Hyraxia Books].