Books in the Castle series

If New York Police captain Nikki Heat is acting like she's seen a ghost, it's for good reason. Her mother, Cynthia, presumed dead for seventeen years, has resurfaced-but the threat that made her go into hiding is as grave as ever.

The tenth Nikki Heat novel, set in the universe of the Castle TV series.

An ISIS-style beheading of a journalist, carried out by a New York City group pledging fealty to that rogue state, becomes more than just another case for NYPD Captain Nikki Heat when the killers announce their next target: her husband, magazine writer Jameson Rook.