In just under two months, Mischa Barton will officially be back on the case in the new mystery film Murder at the Embassy. Collider can exclusively share the first trailer for the upcoming whodunnit, which sees The O.C. star step back into the shoes of florist and Agatha Christie enthusiast turned private investigator Miranda Green. First introduced in 2023's Invitation to a Murder, she's now become a more official super sleuth and is taking her skills to Cairo, where a suspicious murder has occurred within the seemingly impervious walls of the British Embassy. What she discovers, however, is a much more concerning case unfolding with potential global implications.