In the fourth season, Annalise works with a therapist, Dr. Isaac Roa, to see through her recovery from alcoholism. She initially cuts ties with Bonnie (who moves to the DA’s office as an assistant district attorney reporting to DA Todd Denver) and the interns, gets a woman with a long rap sheet freed from jail, and then commits to a major class action against the state for miscarriages of justice caused by an underfunded public defender’s office.

Laurel deduces that her father, Jorge Castillo, is responsible for Wes’s murder and hatches a scheme to steal incriminating evidence from his law firm with the help of Michaela, Oliver, Frank, and Asher. During the data heist, their classmate Simon (Behzad Dabu) accidentally shoots himself with Laurel’s gun, leading to Asher’s arrest, and Laurel goes into premature labor after being accidentally struck by Frank.

Annalise successfully saves the baby. However, Jorge claims custody of his grandchild by submitting evidence of Laurel’s past addictions and history of mental illness to a judge. Laurel’s mother arrives unexpectedly to “help” Laurel fight against her father, and Frank and Bonnie uncover a mysterious link between Laurel’s mother and both Wes and his killer, Dominic. Meanwhile, Annalise searches for alternative ways to win her class action lawsuit. On January 3, 2018, a crossover with Scandal was announced which aired on March 1, 2018.