A flashback into the last several days in Beth's life acts as an extended prologue to the current day goings-on of the sisters. Beth has a source who she has not mentioned to anyone, including Art, which leads her and Art to their next case, what Art sees as just the homicide of a man named Edward Capra, but which Beth knows is part of what her source tells her is about the Neolutionists, who are all around her according to the source. As such, the source tells her not to trust anyone, even those closest to her. Two issues of interest concerning Capra are a square piece of his right cheek which has been removed, and reconstruction of his sex organ into two. Beth has to figure out how these two items relate to the Neolutionists. Beth has also just started managing the fund for her, Alison and Cosima, bankrolled by Alison for them to live while Beth largely shoulders the legwork on figuring out what is going on with them. She is dealing with all the stress in her life, which includes a ... Written by Huggo

After evading Neolution in Iceland, Sarah returns home to track down an elusive new ally. She uncovers the next facet of Neolution's agenda. As Cosima struggles with Delphine's disappearance, Alison and Donnie host a pregnant and ever-hungry Helena. Meanwhile Felix, feeling like an outsider, embarks on his own journey of self-discovery.

As Sarah reels from the shocking discovery of Neolution's biotech, she's desperate to find answers. Always impulsive, she follows a lead into a harrowing encounter that requires the help of a reluctant new player. Eager to assist, Mrs. S strikes an alliance with an old nemesis. Rachel receives a visit from her keeper and takes a fraught step forward towards recovery. Meanwhile, Helena is mistaken for Mrs. Hendrix when she answers a visit from suspicious visitors.

Although she doesn't trust him, Sarah knows that Ferdinand now is her strongest lead in getting the bot removed in that he knows the one person who can remove it: Susan Duncan. In return, Ferdinand also wants access to Susan as he knows that she has Rachel, who he wants to save. MK is the person who has the skill set to locate Susan. As Sarah will not divulge MK as her source to him and as Sarah does not want to tell MK that Ferdinand is the person that has been helping her, Sarah needs to act as the go-between. Either finding out the identity of the other could have major repercussions, especially concerning MK's past. While out for coffee, Alison is accosted by Trina believing her to be Beth. Trina's accusations lead to Alison needing to follow another path to a fertility clinic to find the link back to Neolutionists. As she knows that one of her sisters has been to the clinic, Alison needs to enlist the help of others to infiltrate the clinic. This includes Felix, who has reemerged... Written by Huggo

With Sarah taking a mom day with Kira and Alison busy with a committee meeting, Cosima volunteers to accompany Donnie to the BrightBorn orientation session pretending to be the surrogate mom, which she hopes will allow her to do some snooping around the facility to discover what scientifically BrightBorn is actually doing. It is a difficult enough situation made all the more difficult when they discover upon arrival that Evie Cho will be at the orientation. It becomes even more confusing with the arrival of another unexpected person, who is unaware of Leda but has her own suspicions of something nefarious going on in her world, which almost got her killed. Sarah and Felix are still at odds with each other over Adele in his life, Sarah not believing that they truly are biological siblings and that Adele is in his life for some other nefarious reason. Their antagonism is increased by Felix bringing Adele to the safe house, and by Sarah discovering that Geneconnecxion, the company that ... Written by Huggo

Seeing that it is the best overall solution yet not perfect by any means, Sarah and Cosima decide with Kendall's OK to set up an agreement with Susan Duncan, which they will not divulge to Mrs. S. until everything is arranged as they know she won't like what they've done. That agreement is an agent representing Susan will remove the bot from Sarah's cheek, with Cosima on site to ensure Sarah's safety. As Scott and Cosima have not yet come up with a cure for Cosima and the other affected Leda clones, they in turn will provide their research and Kendall to Susan, with Scott harvesting the necessary cell from Kendall so that Susan can continue the work on curing the affected Leda clones. The agreement does not include providing any of Kendall's DNA for the Castor project. When these two sides of the agreement are accomplished on neutral sites, Susan's agents will release Cosima, while Kendall will be whisked away to safety back at the safe house. While those involved hope to get what ... Written by Huggo

Sarah regresses to old habits while struggling to cope with the consequences of her decisions - reconnecting with Beth on a dark night of the soul. Back at the lab, Cosima, haunted by vicious memories and news of Delphine, attempts a dangerous Hail Mary to find a cure. At the Hendrixes, Alison is more determined than ever to create normalcy for her kids. As she forges ahead with a birthday party, Donnie is caught in the Neolution crosshairs.

Despite not knowing where she's gone or why she's back, Sarah reconnects with MK, who is able to provide some information as to the fact that the Neolutionists under Evie Cho see especially Sarah, but also Alison and Cosima, as threats to the project. As such, Sarah asks MK for one more favor in getting her in touch with Susan Duncan, who may now be more of an ally in finding a cure for Cosima. However Rachel being aligned with Susan may still be an issue. In the process, Cosima believes she may have found at least a starting point for their future research, which involves a reluctant Sarah. Rachel, in the meantime, has been seeing visions, including of swans, which she believes are not hallucinations but something implanted into her eye. Meanwhile, Mrs. S is still determined to get some revenge for her mother's murder, and to discover what Evie Cho's end game is so that she can help find some peace for the sisters. Both those roads lead to Marty Duko. However, a potential issue is ... Written by Huggo

The formal alliance between the sisters on one side Susan/Rachel/Ira on the other side begins in earnest. Cosima has arrived on the island where she and Susan will begin the process of finding a cure for both Leda and Castor by developing original DNA in the absence of Kendall through fertilization of one of Sarah's eggs with Ira's sperm, while Sarah and Felix meet with Rachel and Ira to discuss the next step in bringing down Evie Cho and restoring Susan as the head of Neolution. As Evie ramps up her media campaign to bring BrightBorn's work to the masses, Sarah, Rachel, Felix and Ira learn that two women, Tabitha Stewart and Kendra Dupree, have escaped from BrightBorn's facility, Tabitha near the end of her pregnancy and Kendra with her newborn. Rachel believes that what Tabitha and Kendra know and bringing it to public light is the key to exposing Evie's work. Sarah is determined for her side to do the work in finding the two women despite Sarah being Evie's primary target, having... Written by Huggo

When communication with Cosima is cut off and Neolution appears to be within striking distance, Sarah's alliance with Rachel goes out the window. Sarah lures a high-level Neolutionist into a trap, and sets out to bring down Neolution once and for all.