Ken and Sandy solve the mystery of the strange goings-on at the exclusive resort on Skeleton Island. THE RIDDLE OF THE STONE ELEPHANT In Colorado gathering data for Ken's dad about an old lawsuit between two ranchmen over water rights, Ken and Sandy find every move thwarted, every action watched. THE BLACK THUMB MYSTERY Ken and Sandy prove the innocence of a banker who has been found guilty of conspiracy in a robbery. The boys track down many clues before they discover the motive behind the sinister plot. THE CLUE OF THE MARKED CLAW Vacationing in a fishing village on Long Island, Ken and Sandy play an unexpected part in the capture of a dangerous ring of smugglers. GROSSET & DUNLAP Publishers of WORDS: _The New Dictionary_ NEW YORK 10, N. Y. * * * * * THE HARDY BOYS _Mystery Stories_ By FRANKLIN N. DIXON All boys from 11 to 15 who like lively adventure stories, packed with mystery and action, will want to read every one of the exciting Hardy Boys stories listed below. Sons of a famous American detective, the Hardy boys help solve many thrilling mysteries after school hours and during vacations, as they follow up the clues they unearth in their quest to bring criminals to justice. _Now Available:_ 1. THE TOWER TREASURE 2. THE HOUSE ON THE CLIFF 3. THE SECRET OF THE OLD MILL 4. THE MISSING CHUMS 5. HUNTING FOR HIDDEN GOLD 6. THE SHORE ROAD MYSTERY 7. THE SECRET OF THE CAVES 8. THE MYSTERY OF CABIN ISLAND 9. THE GREAT AIRPORT MYSTERY 10. WHAT HAPPENED AT MIDNIGHT 11. WHILE THE CLOCK TICKED 12. FOOTPRINTS UNDER THE WINDOW 13. THE MARK ON THE DOOR 14. THE HIDDEN HARBOR MYSTERY 15. THE SINISTER SIGN POST 16. A FIGURE IN HIDING 17. THE SECRET WARNING 18. THE TWISTED CLAW 19. THE DISAPPEARING FLOOR 20. THE MYSTERY OF THE FLYING EXPRESS 21. THE CLUE OF THE BROKEN BLADE 22. THE FLICKERING TORCH MYSTERY 23. THE MELTED COINS 24. THE SHORT-WAVE MYSTERY 25. THE SECRET PANEL 26. THE PHANTOM FREIGHTER 27. THE SECRET OF SKULL MOUNTAIN 28. SIGN OF THE CROOKED ARROW 29. THE SECRET OF THE LOST TUNNEL 30. THE WAILING SIREN MYSTERY G R O S S E T & D U N L A P _Publishers_ N E W Y O R K * * * * * _The_ RICK BRANT SCIENCE-ADVENTURE _Stories_ BY JOHN BLAINE THE ROCKET'S SHADOW THE LOST CITY SEA GOLD 100 FATHOMS UNDER THE WHISPERING BOX MYSTERY THE PHANTOM SHARK SMUGGLERS' REEF THE CAVES OF FEAR * * * * *