Last Sentinel
A nice little close circle thriller. Simple, slow burner, twisty. Overdeveloped in terms of world building, the characters take a back seat.
Four soldiers man a station in the middle of the ocean, Sealand style. They have a 20 MT nuke and the codes to use it. The station is on the midpoint between the two remaining landmasses, after climate change flooded the entire planet.
Activating the nuke floods both landmasses, destroying life on Earth. At least the cool ones, sea bases critters would thrive.
No one looks what they seem: the captain is harsh, but fair and well intentioned, the handyman is a violent Glaswegian. Then there’s also Trinity, a literal spy from Eastasia.
Eventually, three of the characters try to detonate the bomb for various reasons. When the main guy does it in the end, after knowing the only person he had a connection with is a spy and has been murdering the relief crews to get her hands on the bomb, it’s a dud. Or the other guy rigged it, the Glaswegian tech genius. They keep together to safeguard the bomb.
This is my place for ramblings about sequences of images that exploit the human visual limitation know as persistence of vision.