Clara

"Not to be weird, but you look a lot like my mother," Andy said.

"Is she from here?" Clara asked. "I might know her."

"Her name's Kelly Calles."

Clara's face morphed into one of confusion and then panic. "That's my mother's first name. Her last name was Mahza when I was born."
///
Five years after their mother's death, the Calles children along with their father celebrate by traveling to Denmark.

Needing a break from his family, the eldest wanders to a bar where he meets a young woman that looks nearly identical to his mother.

Chaos appropriately ensues.
///
It's not necessary to read The May Incident trilogy but it would help A LOT if you already know these characters. I'd recommend it, but it's not necessary.