When the Callahans found Katya they soon discovered that she was the most powerful Time Pilgrim they'd ever employed at their time research facility, National. However, they soon discover she's plagued with a condition known as temporal amnesia. She can't remember what year she's from and is trying to locate her roots. Because of Katya's time displacement, she's not matured physically beyond the age of twenty, although she's much older. She becomes a sponge in every time period she visits, soaking up the culture and instantly becoming one with the period. Katya and Cyrus--the Callahans' son--develop a love interest along with a powerful time travel partnership. Before Katya came into his life, Cyrus was all business. Katya shows him that time can sometimes be traveled just for the sheer fun of it, while still trying to fight off temporal attacks by Sundial, an adversarial time organization.