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Sounds like the Epstein Drive, perhaps version 0.1:

Not even close both thrust & ISP wise. "Initial commit!" version of it at most. ;-)

The Epstein drive is great, but it only lets one travel to the private island.

...

Alright, alright! I’ll show myself out.

One would have thought the name was already "radioactive" when the Expanse books were written.

Those Sweathogs really got around!