A PROBLEM IN COMMUNICATION by MILES J. BREUER, M.D. The Delivery of His Country into the Clutches of a Merciless, Ultra-Modern Religion Can Be Prevented Only by Dr. Hagstrom's Deciphering an Extraordinary Code. JETTA OF THE LOWLANDS by RAY CUMMINGS Fantastic and Sinister Are the Lowlands into Which Philip Grant Descends on His Dangerous Assignment. (Beginning a Three-Part Novel.) THE TERRIBLE TENTACLES, OF L-472 by SEWELL PEASLEE WRIGHT Commander John Hanson of the Special Patrol Service Records Another of His Thrilling Interplanetary Assignments. MAROONED UNDER THE SEA by PAUL ERNST Three Men Stick Out a Strange and Desperate Adventure Among the Incredible Monsters of the Dark Sea Floor. (A Complete Novelette.) THE MURDER MACHINE by HUGH B. CAVE Four Lives Lay Helpless Before the Murder Machine, the Uncanny Device by Which Hypnotic Thought Waves Are Filtered Through Men's Minds to Mold Them Into Murdering Tools. THE ATTACK FROM SPACE by CAPTAIN S. P. MEEK From a Far World Came Monstrous Invaders Who Were All the More Terrifying Because Invisible. EARTH, THE MARAUDER by ARTHUR J. BURKS Martian Fire-Balls and the Terrific Moon-Cubes Wreak Tremendous Destruction on Helpless Earth in the Final Death Struggle of the Warring Worlds. (Conclusion.)