Briana Cuoco

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 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.

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.

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.

Christy learns that she and her younger classmate are a good team, in and out of the classroom; Bonnie lends a hand when a newly sober Natasha worries she can't handle motherhood.