Reeling from the untimely death of his parents in a car accident Drew (Bryan James) moves in with his Aunt Kathy (Sarah Brown) in her Calabasas home and begins attending a private school. After meeting and befriending Mallorie (Shelley Regner) and Sean (Andrew de Burgh) the three best friends navigate through high school. Drew begins to deal drugs, develops a crush on a girl at school and is beaten by a rival with a bat which puts him in a coma and temporarily erases his memory. Mallorie and Sean help him regain his memories.
Drew is revealed to be bisexual. Mallorie and Sean begin dating. Drew’s best friend Cody (Benjamin Stone) moves into the family home after becoming homeless. Drews ex girlfriend who ended up in a mental ward returns to town determined to win him back. She eventually is arrested and committed. Drew is blackmailed by peers at school and eventually everyone learns he is dating a guy.
Drew ends up in a love triangle with two other boys at school. He ultimately chooses to be with neither of them as it is revealed to the audience Drew has a multiple personality called Joshua. Drew’s older sister Zoe (Chrishell Stause) returns to town but Drew has no idea they are related. Mallorie and Drew have a falling out and end their friendship. Aunt Kathy struggles to keep Joshua at bay as the audience learns that Joshua has existed for many years and was created as a defense mechanism for Drew who was molested by his father at a young age and couldn’t handle it.
Cody gets cancer and dies. Zoe secretly works for the government and reports to a man who has discovered a cure to bring people back from the dead. Drew’s multiple personality Joshua takes control of his life and terrorizes Sean. Joshua plans to take money from Sean and leave town to start a new life. Sean and Mallorie break up and Mallorie marries a cult leader. Joshua is thrown into the psych ward after being tricked by Sean. He eventually escapes and Drew regains control of his body. Drew learns the shocking truth that Josh has existed for many years. Monica Reynolds (Melissa Archer) and her brother Travis (Andrew Trischitta) struggle to reconnect. Drew argues with Shane Edmundson (Guy Wilson) over his mistreatment of Drew’s cousin. Cody is brought back to life along with several others thanks to the miracle drug Zoe’s boss manufactured. Zoe doesn’t agree with bringing people back from the dead and quits her job.
Aunt Kathy wants Zoe to return to being part of the Castle family. Zoe bonds with new coworkers Tyler (Kaiser Johnson) and Jimmy (Drew Garrett) as the three work undercover in Calabasas. Drew struggles to make a relationship with Oliver (Ryan Malaty) work. A serial killer begins to terrorize and prey on Drew and his loved ones. Many believe Joshua might be the killer. Drew’s friend Natalie Cardin (Eden Reigel) and her boyfriend Eric (Bryan Datillo) are two of the killers first victims. Zoe becomes Drew’s personal body guard but chooses to keep their family bonds a secret. Mallorie, terrorized by her husband and the life she now lives, flees the cult in the middle of the night. Sean goes to jail for killing someone while driving drunk but is released early due to his fathers business connections. Monica tracks the serial killers patterns helping the town discover who or whom is behind the brutal murders and eventually becomes the chief of police. Tina Milhouse (Carolyn Hennesy) comes to town upset her son has feelings for Drew and putting his life in danger. Drew bonds with a female nurse (Lorry Plasterer) whose origins remain a mystery. Drew and Zoe discover their father Luke Castle (Matt Walton) is the mastermind behind the serial killings and the two barely escape with their lives.