The novel “Almost Perfect” by James Goss was published for the first time in 2008.
Emma Webster is a young woman who can’t find the right man, even by trying speed dating. One evening, while she’s jogging, she sees on the beach a woman in a state of unconsciousness who has in her hands a strange device. When Emma takes it, it starts talking to her telepathically promising to improve her life.
Ianto Jones wakes up and discovers that he has turned into a woman but can’t remember how it happened. Captain Jack Harkness gives Ianto an anti-retcon pill to try to stimulate his memory and shed light on his transformation. In the meantime, together with Gwen Cooper, he starts investigating a ferry incident with its passengers not remembering anything that happened. As if this weren’t enough, Gwen is called by a former colleague of the Police who tells her about the finding of a skeleton in strange circumstances.