JOHN BRUNNER – Threshold of Eternity. Ace Double D-335, paperback original, 1959. Cover by Ed Emshwiller. Published back to back with The War of Two Worlds, by Poul Anderson. Previously published in New Worlds SF #66, December 1957.

   Two people of the 20th Century, a sculptor from California and a London nurse, are caught up in a space-war encompassing all of space and time. The enemy is intent on destroying the Being, located in the Solar System, and existing in four dimensions. But as time itself is no barrier to the being, dedicated to the welfare of Man, parallel time-streams can sculpted for that purpose.

   Truly large-scale action, but someone not used to sf concepts would give up early, as the true story becomes clearer only gradually. Brunner takes his concepts seriously, but this is not one of the better works on the structure of time and space. Explanatory material is presented through dialogue and actions of the characters, as they too struggle through the mysterious happenings, and hence is only partial. All scenes are neatly tied together, but the reader merely goes long for the ride.

Rating: **