Although disappointed at not being chosen to be the flower girl in her best adult friend's wedding, third-grader Grace plans a special surprise for the big day.

Adam Blaine arrives at the funeral of his estranged father, Ben Blaine, a famous and charismatic writer who left behind him a string of secret legal and financial arrangements. Using his training as a CIA operative, Adam seeks to find the truth of his father's death, even if it means exposing one or more of his own family members as the killer and discovering secrets about himself that he was never supposed to know.

Safely back in 1803 England, Merlin's Irregulars are more confident, proud, and powerful, but class distinctions complicate their relationships until the mages are called upon to rescue a vitally important French scientist and his family from Nazi-occupied France.

While Grace and her best friend Mimi are waiting for the arrival of the baby sister Mimi's family plans to adopt, Grace gets a big surprise.