When the pilot episode completed, Kate Kane (RUBY ROSE) had a strong suspicion that the terrorist Alice (RACHEL SKARSTEN) was actually her long-thought-dead twin sister, Beth, based on the evidence of a dagger Alice left behind that has a gemstone in the handle that matches the one in Kate's necklace -- the twin of the one her sister owned.
Convincing her father, Jacob Kane (DOUGRAY SCOTT) of that proves to be another matter entirely. He is convinced -- or seems to be convinced -- that Beth died, citing the evidence of skull fragments being found that matched Beth's DNA. But if Kate can get some DNA off that knife, she may just prove herself to be correct.
Alice wants her lost knife. Someone is wanting to get the knife away from Kate.
The two events are not necessarily related, which puts Kate into the suspicion that there's a third side to this game, hidden from view and playing by their own rules.