The Takeover is a 6-book series with 6 released primary works first released in 2010 with contributions by Day Leclaire, Emily McKay, Catherine Mann, Sandra Hyatt, Yvonne Lindsay, and Michelle Celmer.
Each of the first 5 books have short stories by Catherine Mann about the H/h in book 6, Rafe and Sarah, that predate the story in book 6.
In the English versions of the books, mention of this has been removed from the book titles, but has remained in the book description. Catherine Mann has been given second position author credit in the first 5 books.