The couples are getting ready for Valentine's Day: Leonard, Penny, Howard and Bernadette are going to dinner, and Sheldon and Amy are trying to get the perfect gifts for each other.
The Behavioural Analysis Unit heads to Chicago to examine a case where the culprit leaves red roses on their victims; Rossi's ex-wife pays him an unexpected visit.
The team investigates a petty officer's murder that was live streamed on a popular gaming app; Gibbs watches his 11-year-old neighbour, when his mum must leave on a last-minute trip.
Will apologises on-air for past newscasts; Charlie is warned by management; Jim soothes Maggie during a panic attack; Will parades his dates in front of Mac.
The team investigate when a fundraising party for a new musical is interrupted by a dead body falling from a balcony and landing on top of a car; Jane waits for the only man who may be able to identify Red John to regain consciousness.