Dave Porter on Cave Island; Or, A Schoolboy's Mysterious Mission

“Empty!” murmured Dave sadly. “Empty!”— Page 217.
Dave Porter Series
DAVE PORTER ON CAVE ISLAND
A SCHOOLBOY’S MYSTERIOUS MISSION
EDWARD STRATEMEYER
Author of “Dave Porter at Oak Hall,” “Dave Porter in the South Seas,”
“The Gun Club Boys of Lakeport,” “Old Glory Series,”
“Pan-American Series,” etc.
ILLUSTRATED BY H. RICHARD BOEHM