There’s a boring red brick building in the middle of Yale University’s campus. If you walk past it you might think it’s an administrative office. It looks - boring. But if you look closely - there are 75 CCTV cameras pointed directly at the building. Covering every square inch of the exterior. Why would they need so much security for a university building? It is the Animal Research Laboratory. It houses over 4k research mice and has tens millions of dollars of research experiments being conducted inside the brick walls. It is one of the most secure buildings on campus. Till a brilliant Yale graduate student disappears inside. She walks in. Never walks out. She is nowhere to be found in the building - or at least that’s what the authorities initially thought. But have they checked the walls?