Shiel had married a young Parisian-Spaniard, Carolina Garcia Gomez in 1898; she was the model for a character in "Cold Steel" (1900) and several short stories. (The Welsh author and mystic Arthur Machen and decadent poet Theodore Wratislaw were among the wedding guests.) They separated around 1903 and his daughter was taken to Spain after Lina's death around 1904. Shiel blamed the failure of the marriage on the interference of his mother-in-law, but money was at the heart of their problems. Shiel was caught between his desire to write high art and his need to produce more commercial fare. When his better efforts did not sell well, he was forced to seek more journalistic work, and began to collaborate with Louis Tracy on a series of romantic mystery novels, some published under Tracy's name, others under the pseudonyms Gordon Holmes and Robert Fraser. The last of their known collaborations appeared in 1911.