Not just a disaster tale, this story was a plea for the Thames Barrier to be built. There’s also a subplot about the fatal flaw in the design of a particular type of high rise, for good measure.
A storm surge meets a high tide and rain laden Thames, and London is about to be overwhelmed. As the emergency response sees its coordination hampered by politicians trying to manage the news cycle, the water keeps rising, and a series of little dramas are set in play.
The author established early on that he had no problem killing likeable characters you expect to live, giving tension to the final rescue.
Dated in some ways, but the threat of flooding remains, even if the barrier did get built.