What seems to be the complete run of the Secret Service dime novel magazine (1899-1912, home of the Bradys) is now available in full-text via Google Books. The juvenile Lovecraft was an avid reader in the second half of its run. Search Google Books for: “Secret service” “bradys” -bunch   The Bradys frequently ventured to Chinatown and its underground tunnels, into decaying swamp houses, at least once to the Arctic, several times to Africa, exposed numerous fraudluent magicians and spiritualists, and opium dealers — among other themes that Lovecraft fans will be familiar with.