This Gray Spirit is a Star Trek: Deep Space Nine by Heather Jarman published by Pocket Books in 2002. It is the sixth novel in the DS9 relaunch and the second in Mission Gamma. The novel centers around the crew of the Defiant encounting an unusual species and getting involved in a dispute, while the Bajorans and the Cardassians begin negotiations on Deep Space 9. The novel was reprinted in the omnibus These Haunted Seas in 2008.