Scotland Yard detectives attempt to solve a spate of safe robberies across England beginning with clues found at the latest burglary in London. The film is notable for using a police procedural style made popular by Ealing in their 1950 film The Blue Lamp. It is known in the US as The Third Key.
%20by%20%E2%80%9ENatalia%20Spivak%E2%80%9D%2C%20licensed%20under%20%E2%80%9ECC%20BY%204.0%E2%80%9D%20(https%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby%2F4.0%2F)%3C%2Fdc%3Arights%3E%3C%2Frdf%3ADescription%3E%3C%2Frdf%3ARDF%3E%3C%2Fmetadata%3E%3Cmask%20id%3D%22viewboxMask%22%3E%3Crect%20width%3D%2280%22%20height%3D%2280%22%20rx%3D%220%22%20ry%3D%220%22%20x%3D%220%22%20y%3D%220%22%20fill%3D%22%23fff%22%20%2F%3E%3C%2Fmask%3E%3Cg%20mask%3D%22url(%23viewboxMask)%22%3E%3Crect%20fill%3D%22%23619eff%22%20width%3D%2280%22%20height%3D%2280%22%20x%3D%220%22%20y%3D%220%22%20%2F%3E%3Cpath%20d%3D%22M19.07%2030.47s1.57-20.23%2021.59-20.23S62.3%2030.55%2062.3%2030.55s9.43-.8%209.43%207.6c0%208.42-9.28%207.13-9.28%207.13S60.9%2067.15%2042.03%2067.15c-21.11%200-23.4-20.8-23.4-20.8s-9%20.72-9.93-6.25c-1.08-8.2%2010.37-9.64%2010.37-9.64%22%20fill%3D%22%23c26450%22%2F%3E%3Cpath%20d%3D%22m64.3%2039.49.46-.41.1-.09c.12-.1-.13.1-.02.02l.24-.17q.5-.35%201.06-.62l.26-.12.05-.02.05-.02.58-.21q.6-.18%201.2-.28c.52-.08.85-.76.7-1.23-.18-.56-.67-.8-1.23-.7a9.3%209.3%200%200%200-4.87%202.43c-.38.36-.4%201.06%200%201.4.4.36%201%20.4%201.4%200zm-51.8-1.16.14.01c-.27-.02-.11-.01-.04%200l.3.05.52.14.28.09.12.05c.02%200%20.22.09.06.02-.14-.1%200-.04.03-.03l.15.06.26.13.47.3.27.22q.47.38.83.83c.33.4%201.07.37%201.41%200%20.4-.43.36-.98%200-1.4a7.3%207.3%200%200%200-4.84-2.53c-.52-.06-1.02.5-1%201%20.03.59.44.94%201%201m18.3-1.9v4.54c0%20.52.46%201.02%201%201s1-.44%201-1V36.4c0-.52-.46-1.02-1-1s-1%20.44-1%201M49.2%2036l-.15%204.81a1%201%200%200%200%201%201c.56-.02.98-.44%201-1l.15-4.8a1%201%200%200%200-1-1%201%201%200%200%200-1%201%22%20fill%3D%22black%22%2F%3E%3Cpath%20d%3D%22M30.36%2048.8c.6-.5%202.22-2.29%202.9-2.12.41.1%201.03%201.1%201.3%201.41l1.57%201.74c.48.53%201.2.28%201.57-.2.88-1.15%202.48-2%203.68-2.78l-1.21-.16c1.02%201.08%202.36%202.66%203.9%203.06%201.34.34%202.28-.9%203.12-1.7q.44-.47.87-.88.3-.28.58-.58.1-.2.28.28c.72.5%201.33%201.4%201.92%202.04.89.94%202.3-.48%201.4-1.4l-1.91-2.05c-.45-.47-.9-.97-1.62-1-.6%200-1.08.35-1.5.73-.7.65-1.35%201.36-2.02%202-.05.07-.52.63-.66.64-.08%200-.24-.16-.33-.2-.42-.17-.8-.58-1.13-.88q-.78-.72-1.5-1.5a1%201%200%200%200-1.2-.17c-1.52%201-3.28%202.04-4.4%203.5l1.57-.2-2.3-2.53c-.51-.57-1.04-1.17-1.84-1.3s-1.45.3-2.06.8l-2.41%202c-1%20.82.43%202.23%201.4%201.4z%22%20fill%3D%22black%22%2F%3E%3Cpath%20d%3D%22M20.23%2032.43s13.74%2023.53%203.86%2028.24C12.83%2066.03%202.59%2050.96%203.9%2039.72s10.94-16.35%2010.94-16.35-.58-9.5%209.2-15.04%2016.64.44%2016.64.44%208.06-5.9%2015.5-1.37c7.46%204.53%207.26%2014.68%207.26%2014.68s13.74-.56%2013.65%2016.47c-.08%2015.17-10.03%2022.94-16.8%2021.6-10.48-2.07%201.24-29.22%201.24-29.22s-14.4%201.04-20.14-9.75c0%200-4%205.95-9.7%208.62a32%2032%200%200%201-11.46%202.64z%22%20fill%3D%22%23ffffff%22%2F%3E%3C%2Fg%3E%3C%2Fsvg%3E)
%20by%20%E2%80%9ENatalia%20Spivak%E2%80%9D%2C%20licensed%20under%20%E2%80%9ECC%20BY%204.0%E2%80%9D%20(https%3A%2F%2Fcreativecommons.org%2Flicenses%2Fby%2F4.0%2F)%3C%2Fdc%3Arights%3E%3C%2Frdf%3ADescription%3E%3C%2Frdf%3ARDF%3E%3C%2Fmetadata%3E%3Cmask%20id%3D%22viewboxMask%22%3E%3Crect%20width%3D%2280%22%20height%3D%2280%22%20rx%3D%220%22%20ry%3D%220%22%20x%3D%220%22%20y%3D%220%22%20fill%3D%22%23fff%22%20%2F%3E%3C%2Fmask%3E%3Cg%20mask%3D%22url(%23viewboxMask)%22%3E%3Crect%20fill%3D%22%23619eff%22%20width%3D%2280%22%20height%3D%2280%22%20x%3D%220%22%20y%3D%220%22%20%2F%3E%3Cpath%20d%3D%22M19.07%2030.47s1.57-20.23%2021.59-20.23S62.3%2030.55%2062.3%2030.55s9.43-.8%209.43%207.6c0%208.42-9.28%207.13-9.28%207.13S60.9%2067.15%2042.03%2067.15c-21.11%200-23.4-20.8-23.4-20.8s-9%20.72-9.93-6.25c-1.08-8.2%2010.37-9.64%2010.37-9.64%22%20fill%3D%22%23ffd6c0%22%2F%3E%3Cpath%20d%3D%22m64.3%2039.49.46-.41.1-.09c.12-.1-.13.1-.02.02l.24-.17q.5-.35%201.06-.62l.26-.12.05-.02.05-.02.58-.21q.6-.18%201.2-.28c.52-.08.85-.76.7-1.23-.18-.56-.67-.8-1.23-.7a9.3%209.3%200%200%200-4.87%202.43c-.38.36-.4%201.06%200%201.4.4.36%201%20.4%201.4%200zm-51.8-1.16.14.01c-.27-.02-.11-.01-.04%200l.3.05.52.14.28.09.12.05c.02%200%20.22.09.06.02-.14-.1%200-.04.03-.03l.15.06.26.13.47.3.27.22q.47.38.83.83c.33.4%201.07.37%201.41%200%20.4-.43.36-.98%200-1.4a7.3%207.3%200%200%200-4.84-2.53c-.52-.06-1.02.5-1%201%20.03.59.44.94%201%201m18.3-1.9v4.54c0%20.52.46%201.02%201%201s1-.44%201-1V36.4c0-.52-.46-1.02-1-1s-1%20.44-1%201M49.2%2036l-.15%204.81a1%201%200%200%200%201%201c.56-.02.98-.44%201-1l.15-4.8a1%201%200%200%200-1-1%201%201%200%200%200-1%201%22%20fill%3D%22black%22%2F%3E%3Cpath%20d%3D%22M30.36%2048.8c.6-.5%202.22-2.29%202.9-2.12.41.1%201.03%201.1%201.3%201.41l1.57%201.74c.48.53%201.2.28%201.57-.2.88-1.15%202.48-2%203.68-2.78l-1.21-.16c1.02%201.08%202.36%202.66%203.9%203.06%201.34.34%202.28-.9%203.12-1.7q.44-.47.87-.88.3-.28.58-.58.1-.2.28.28c.72.5%201.33%201.4%201.92%202.04.89.94%202.3-.48%201.4-1.4l-1.91-2.05c-.45-.47-.9-.97-1.62-1-.6%200-1.08.35-1.5.73-.7.65-1.35%201.36-2.02%202-.05.07-.52.63-.66.64-.08%200-.24-.16-.33-.2-.42-.17-.8-.58-1.13-.88q-.78-.72-1.5-1.5a1%201%200%200%200-1.2-.17c-1.52%201-3.28%202.04-4.4%203.5l1.57-.2-2.3-2.53c-.51-.57-1.04-1.17-1.84-1.3s-1.45.3-2.06.8l-2.41%202c-1%20.82.43%202.23%201.4%201.4z%22%20fill%3D%22black%22%2F%3E%3Cpath%20d%3D%22m21.33%2033.18%202.52-10.73%208.65%202.8%201.5-4.54%209.34%204.35%202.12-4.6%206.96%205.07%205.55-2.34%201.22%2010.75%207.74-8.28-3.9-2.32.83-7.38-3.27.2-1.02-6.95-4.1%202.53-3.86-5.2-3.63%202.12-9.1-4.3-1.01%203.59-7.17-1.48v3.8h-9.21l1.64%204.22-8.4%203.16%204.5%202.95-4.5%204.22z%22%20fill%3D%22%23ff543d%22%2F%3E%3C%2Fg%3E%3C%2Fsvg%3E)
