Adrenaline (The Sam Capra series (1))

Sam Capra lives an idyllic life. An American, living in London, he has a perfect job with the CIA and a perfect wife, Lucy - who is seven months pregnant with their first child. But then it all goes up in flames. At work, Sam receives a call on his cell from Lucy. She tells him to leave the building immediately, which he does - just before it explodes, killing those inside. Lucy vanishes, and Sam wakes up in a cold, dark prison cell. Why did Lucy call him? Was she a loving spouse or an enemy operative? Is Sam's unborn child safe?