Her Guardian Angel by Felicity Heaton

A love so strong it will shake Heaven and Hell.

A guardian angel dedicated to his duty, Marcus will do whatever Heaven asks of him, but even his loyalty has its limits. When his superior orders him to gain Amelia’s trust through seduction, Marcus starts to question his mission and his feelings for the beautiful woman he has watched over since her birth.
Amelia has gone from one bad relationship to another, so when a gorgeous guy moves in next door looking like Mr Right, she hopes he doesn’t turn out to be another black knight in disguise. But there’s more to Marcus than meets the eye, and when he rescues her from three demonic men, Amelia is thrust into his nightmarish world. On the run from demonic angels and the Devil himself, aided by warrior angels and their amazing women, Marcus and Amelia discover a love that will last forever.
When the strength of that love is put to the test, will Marcus and Amelia win their fight for survival against the odds or will they lose in a deadly eternal game between Heaven and Hell?