When Sister Evangeline of the St. Rose Convent stumbles across a mysterious correspondence with Abigail Rockefeller in the archive, it reveals that angels once walked among us... and might still. This discovery plunges Evangeline into the hidden and dangerous world of the Angelologists - a secret society that battles to prevent the ascendancy of the Nephilim, the angels' descendants on Earth. Evangeline becomes the catalyst in a race to hunt down powerful and ancient artefacts that can be used to enslave humankind. And not only is the key to finding those artefacts within her grasp - but also a secret about her own past and its links to the Angelologists. Possession of either could cost Evangeline her life...