Richard throws everyone for a loop when he switches the resident and attending pairings, and Arizona takes a huge risk on a woman who is pregnant with quadruplets. Meanwhile, April is faced with a difficult decision.
The team explore a deep cave system in an effort to prevent a bat population from harming the North American ecosystem.
The discovery of a dead former MI6 agent uncovers secrets from Tennant's past, forcing her to go to extreme lengths to track down the responsible party.
Jane and Maura investigate the murder of a young woman who was found beaten, raped and strangled outside a gay bar.
After the body of a thief is found in a marine's house, NCIS discovers the calling card of a terror group Delilah that the Department of Defence have been tracking.