The U.S. Military offers Jack, Richard and the Aerojet team a classified mission that could turn the tide of World War II, but which comes with increased scrutiny of Jack's personal life. As Jack strives to straddle the worlds of mysticism and science, Virgil Byrne's crusade against the Agape Lodge forces Jack and Susan to offer the cult safe haven in their Pasadena mansion, only to have their lives further disrupted by the return of Ernest Donovan, who has come back to Los Angeles more broken than ever.

The Magus invites Ernest to stay at the Parsonage, leading Jack to question both men's motives. Richard discovers that Marisol has been hiding a secret from him that could jeopardize their relationship. In an effort to join the ranks of the Agape, Patty shares a shocking discovery with Jack. And with the new rocketry project already on the ropes, Jack finds help from an unlikely source, Aleister Crowley himself.

Jack's conjuring of the Angel earns Ernest's loyalty but divides the Agape, spurring the Magus to investigate the so-called 'miracle.' Marisol attempts to confront her father about the secret that destroyed their family as Richard deals with his broken heart by diving deeper into the rocketry project. Meanwhile, when Susan's attempt to get Thelema officially recognized as a religion hits a roadblock, she turns to Ernest in hopes of putting a stop to Virgil's harassment once and for all.

Following the disastrous party at the Parsonage, Jack loses his security clearance and must strike a dangerous bargain with Wallace to be reinstated. With the police now investigating the Agape, the members' deepest secrets are revealed through a shocking betrayal. Meanwhile, Richard, Chiang and Mesulam are sent to London for a military research project, where Richard goes to great lengths to clear Jack's name. Devastating truths come to light, putting Jack and Susan's future in doubt, and creating the opening that Patty has been looking for.