Ronobir Lahiri

Alan and Jake head out on a road trip; Charlie is shocked to find himself haunted by the ghosts of his ex-girlfriends.

The race for the Chief's position is on, as the doctors compete for Richard's affections, a surgical patient endangers the lives of those around her, and Meredith's Alzheimer's-stricken mother, Ellis, experiences a change in her medical condition.

The 118 faces emergencies at a spin class and a hair salon; a husband and wife find themselves in a compromising position; Buck discovers new cognitive abilities; Hen and Karen find out Denny has been seeing his biological father.

Josh meets his idol Henry Doheny, who's one of the greatest magicians ever! However, the once "Great" Doheny has fallen on tough times. And when this clingy friend needs some help from Drake and Josh, the boys start to wish they could make this magic man disappear.

Trick-or-treating with the 10-year-olds goes awry for Jack and Rebecca. Randall, Kevin and Kate have life-changing Halloweens.

A body is found covered in scratches, leading the BAU to believe that the person responsible has a chronic skin disorder.