Bones In The Castle

Dr Temperance 'Bones' Brennan, the leading Forensic Anthropologist at the Jeffersonian worked with the man of her children, her husband & one of her closest friends for over 12 years.
Special Agent Seeley Booth has been with the Federal Bureau of Investigation Homicide Division working with the Jeffersonian Institute and his wife and faithful partner for years after his time as a sniper.
Detective Kate Beckett with the NYPD Homicide Division has been with her team and her ride along husband since her mothers death years before.
Infamous Writer Richard Castle has been an addition and asset to the NYPD Homicide Division with his writers knowledge.
Since when are they working a homicide & kidnapping case together?