S4, E19: Chuck is put in charge of a top priority mission, but his leadership skills are pushed to the limit when there is a murder in Castle and it's up to him to figure out "who done it." Elsewhere, Morgan's leadership is also tested when his Buy More troops wage war against Large Mart. Meanwhile, Awesome takes on a mission of his own when Ellie finds an alarming new hobby. Recurring guest star Robin Givens appears as Jane Bentley.