Sealed with a Lie - Kat Carlton

In this sequel to the romantic spy-thriller Two Lies and a Spy, Kari must race against the clock on a mission to save her little brother.
Kari Andrews thought life was going to get easier. She was wrong. Following the events of Two Lies and a Spy, she and her brother, Charlie, are left to cope with the aftermath while also adapting to a new school--in another country. But then Charlie disappears.
With her brother's life hanging in the balance, Kari, Evan, Rita, Kale, and some new friends from Generation Interpol (G.I.) set off on a race around Europe at the bidding of a voice on a phone. The voice tells them that they need to jailbreak a thief--a flirtatious, hot thief--steal something from a high-security bio lab, and deliver the goods during what's sure to be a double-cross exchange. Can they succeed before Charlie pays the ultimate price?
"Solid action, high stakes, and a likable heroine keep the pages turning" (Kirkus Reviews).