Castle Season 3 Episode 3 Under the Gun

When Castle and Beckett investigate the murder of a young woman, they soon realize that the victim is actually a professional hitman. As they delve deeper into the case, they discover that the hitman was pursuing a high-profile target, and they must race against time to prevent the target from being assassinated. Meanwhile, Castle struggles with a case of writer's block as he tries to come up with a new book idea, and he turns to his mother for inspiration. With tensions running high and the clock ticking down, Castle and Beckett must think on their feet and work together to outsmart the hitman and solve the case before it's too late.