Lana Elkins is a cybersecurity expert.
When we first meet her, she is the head of her own company, CyberFortress, which must be doing pretty well because it employed around 250 people and had a nice headquarters in Bethesda, Maryland.
She spent ten very productive years as a "cyberspy" at the National Security Agency before going to the private sector. There she would gather more contacts and experience before starting her company. This puts Elkins as likely in her mid-40's based on her experiences, college and then the decade at the NSA followed by a couple years working for someone else and then her own firm. Add to that the fact she has a 14-year old daughter, Emma.
Elkins is a single parent with the absent father being described as "neither wholesome nor present, having fled for good as Emma entered toddlerhood". Her description is based on her daughter have a "sharp likeness to her attractive mother" and Emma being described as having long, black hair, fair skin, and freckles sprinkled across her nose.
CyberFortress, via Elkins' contacts and through its successes, has become an important part in the fight against cyberattacks. Government contracts make up a lot of the firm's income and her periodic analysis of government and private sector vulnerability is regular reading by those in charge, though to her dismay and annoyance, not enough was done in response.
In the various adventures we can follow her on, she will be spearhead counter-attacks against a variety of highly dangerous and resourceful opponents, many nearly as savvy as she and willing to kill at any moment.