Jessica never signed up to be a hero, but she'll be damned if she betrays the people that she loves (even if they happen to kill her mother). After a car crash took away Jessica's biological family, Trish becomes her adoptive sister and the only person she truly cares about. When Trish grows addicted to revenge and bloodlust, Jessica protects her. Jessica even hides her sister when she claws this season's deranged serial murderer, Gregory Sallinger, to a bloody pulp after he kills Dorothy, Trish's mother.
But things take a turn when Jessica figures out that Trish has killed a corrupt cop and an arsonist. Even when Sallinger is in jail, Trish tracks him down and murders him in her ragtag vigilante mask. Jessica then gets an unexpected visit from Luke Cage, who tells her why he sent his brother to the Raft, aka the underwater prison for superpeople.
Jessica alerts the media that Trish has killed three people as the masked vigilante. When Jeri's buddy tries to smuggle Trish out of the country, Jessica tracks her sister down and defeats her once and for all.