Thirteen-year-old Sybilla “Billie” Hartley thought the weirdest thing about her life was growing up in a house full of antique clocks. That is, until a black cat with strange powers shows up—and reveals a secret that changes everything.

Lolo isn’t just magical—she’s a Guardian Cat, part of an ancient order sworn to protect the boundaries of time. When a broken grandfather clock turns out to be a Time Portal, Billie is pulled into a 140-year-old mystery involving a vanished inventor, secret societies, and a man wrongly accused of murder.

With Lolo and Jack—the grumpy but unexpectedly brave son of a local antique dealer—Billie must unlock a hidden key and outwit dangerous forces determined to control the clock’s powers.

But as the past begins to unravel the present, Billie realizes she’s not just solving a mystery… She’s fighting for her family, her future—and time itself.