reminds me of the way the Alderson Drive works in The Mote in God's Eye.
There are certain "Alderson Points" in space, determined by gravitational fields, that always come in pairs, and by using an Alderson Drive you can instantly jump between them.
One character mentions that once when traveling to a certain destination, they had to take an Alderson point to five times the distance in the opposite direction, spend three months to get to another Alderson point, then jump back the way they'd came, because it still took less time than trying to get there sub-FTL.
At one point they have to make a jump but because of, among other things, the closest star being so big, they actually have to dive into the star to get to the point, which becomes a big plot point later when another ship tries to jump the other way, but without shields. Doesn't end well.