Sierra Nealon

Sierra Nealon is the mother of our protagonist, Sienna Nealon. She is a succubus.

Alone
While Sierra does not appear in Alone, we learn the following about her:
 * She has been missing for one week at the start of the book
 * She is one of the most powerful metas of her generation
 * She was a field agent for The Agency for 10 years, responsible for the capture of many hostile meta-humans
 * Believed to have died during the terrorist attack that destroyed The Agency until Sienna was discovered.
 * Has worked as an MRI tech at Hennepin County Medical Center for the past 14 years under the name Brittany Eccleston
 * Per Sienna's description she has dark hair, green eyes, more chiseled features and darker skin than Sienna