Avalon Johnson is the best friend of Leo Dooley. He's like an older brother to her, he and his mother practically raised her after her drunk and abusive father and a mother that was hardly there for her. But when Tasha remarries to billionaire scientist Donald Davenport, and Val and Leo go exploring their new home, they discover a secret lab under the house. And in it are three teenagers. Each with bionic superpowers.
Adam, Bree, and Chase Davenport are three bionic teenagers that have never left the lab. When Val and Leo enter their lives, everything changes. The five become inseparable, closer than any siblings. They become best friends, and Chase and Val feel themselves falling for each other. But she isn't as safe as they thought. Being friends with the Lab Rats, Val finds herself in constant danger, and it's up to them to protect her.
But when you're best friends with three bionic people, there is no such thing as safe.