'Helena — part earth-bound angel, part vampire — is pregnant, and it's playing havoc with her unique abilities. Her usual diet of vampire blood makes her physically ill, one minute she's visible the next she's not, and she's suffering from blackouts.'
'After yet another blackout, Helena finds herself back in Satan's clutches. This time there is no way for her to escape on her own, and a dangerous rescue mission ends with Helena going into labour prematurely.'
'Helena's child is born and all too soon must leave her to deliver a message to the mortal world. But the last time someone was sent with a message, it didn't end well ...' (Source: Barnes & Noble website)