The lives of the Monohan family become unexpectedly complicated after moving into their new home in an exclusive community called "The Gates." In his new job as Chief of Police, Nick Monohan becomes involved in a missing person's case on his first day as he learns his neighbors are hiding their involvement in the case as well as a family secret. Just when his family is finally settling in, Nick receives bad news.

Nick, disturbed by his discoveries about The Gates, investigates the passing of his predecessor. Meanwhile Claire deals with the backlash from her latest misdeed. Brett wants to keep dating Andie but Andie must sort out her feelings for Charlie.

A string of small crimes hits the Gates, starting with a robbery at the McAllister's house. Elsewhere, someone from Claire's past arrives and isn't buying her as a housewife. Lukas continues to pressure Brett to let loose with the rest of the pack.

Bret and the pack receive some unwanted attention when a hunter goes missing. Nick and Dylan try to put their issues aside at the Father Daughter Dance. Andie and Charlie's relationship starts to blossom, but an unexpected surprise flip flops everything.

Just as Nick comes to a dramatic realization that vampires exist, he's forced into a close association with one. But Nick and Dylan's secret is in jeopardy when Marcus looks into Teresa's disappearance. Trouble's in the air when Devon attends a party accompanied by her ex-husband and his new wife. Meanwhile, Charlie is determined to pursue Andie unmindful of the dangers that he may face.

Nick asks Dylan for help in finding the vampire who cuddled a neighbor inside The Gates. Claire can't seem to end her "arrangement" with Christian. Meanwhile, extreme danger is in store for those around Andie when she tries to control her symptoms without her meds.

Nick and Dylan must find a secret about Frank Buckley to level the blackmail playing field. Social politics may ruin Sarah's pool party. Brett and Charlie continue to vie for Andie's affections. Devon has ulterior motives for trying internet dating.

Nick must act as referee between Vampires and Werewolves after Lukas' father is attacked and left for dead. In the middle of it all, Andie and Brett turn to each other. After being refused by Peg, Mia turns to Devon to learn witchcraft. Christian threatens to reveal his true relationship with Claire.

The FBI shows up at The Gates looking for a criminal, putting demands on Nick who must preserve the harmony within his community and guard the community's dark secrets all the while meeting the FBI's demands for cooperation.

Dylan and Claire ask Nick for help after Emily is kidnapped. Nick's search will lead him outside The Gates and to some horrific truths about their vampire past. Sarah, who's feeling left out, presses Nick for details about the case. The realities of Brett's relationship with Andie surface while Charlie becomes aware that those around him are not human.

Nick's past comes back to haunt him - again. Emily's Aunt Nancy shows up with a social worker to find out all about the Radcliffe's home life and Claire fears this could be dangerous for her family. Dana makes a concerted effort to reunite Charlie and Andie but romance is put on the back burner when someone or something schemes to torment the Monohan family.

Vanessa and Frank's latest decision may just tear apart The Gates. Sarah shuns those around her and seeks temporary relief with Devon after learning that The Gates abounds with Supernaturals, but she's going to learn that Devon is the one person she can't trust. Brett is enraged that Andie and Charlie are back together but his extreme actions to remedy this will have far-reaching effects.

After Vanessa and Frank's passings, the Monohans make plans to move from The Gates. Their plans are interrupted when Charlie runs away with Andie. Brett then goes off in search of Andie before her Succubus side comes out. Dylan and Claire must find Devon before she can use her ability to destroy all the world's vampires. As all these stories converge, the one person no one can trust is the one person the Monohans need most.