If Else Paradise

Drawn into an extraterrestrial war, Ingvild Tang will do anything to meet her anchor, the cognate meant to be the other half of her quantum pair.
When sent to retrieve an anomaly—the husk of an alien neither dead nor alive—she encounters an enemy agent who looks too familiar: Hua Ziyi, a version of a woman she loved and lost, but from another timeline.
They soon begin a chase, cat and mouse, seducer and seduced, as warring factions fight for supremacy. Each of the women has a unique connection to the anomaly. Each of them could make or break the war—or shatter spacetime for good.
All they have to do is to choose: each other, or their factions victory?