Amy has always loved a good mystery. So when her classmate Reagan invites her to a murder-mystery-themed birthday party, she should be ecstatic. But… she’s not. Instead, she’s worried that her social anxiety will mess everything up.

Thankfully, all the guests are given characters to play for the night, so Amy doesn’t have to go to Reagan’s party as herself—she’ll go as “Millie Morgan,” a scientist looking to solve the murder and clear her name. With newfound confidence as Millie, she must work with the other partygoers to solve the crime.

But when evidence piles up and clues begin to incriminate her alter ego, Amy’s anxiety comes rushing back. With the help of her new friends, Amy must learn to navigate her own anxiety as Millie works to solve the mystery and prove her innocence.