Guest Stars Margo Harshman as Delilah Fielding Seamus Dever as NCIS Deputy Director Gabriel LaRoche Michelle Lukes as Gemma Wood Brooke Lyons as Tammy LaRoche Abby Awe as Lucy Lauren McKnight as Miss Sharpe aka Assassin Co Starring Essam Ferris as Yann Morgan Peter Brown as Paul Morton / The Poet Bonnie Bailey-Reed as Flo Nathaniel Best as REACT Leader
