Witch's Cauldron by Ella Summers — book slip

Leda Pierce has survived the gods' first test and gained entry into the Legion of Angels, but the fight is far from over. In New York, supernaturals are being poisoned, and the Legion suspects witches.

Leda is sent to investigate, needing magic she doesn't have. Her survival depends on accepting help from the darkly seductive angel Nero, but that help comes with a price she cannot afford to pay.

Second in the Legion of Angels series.