Separated when they were 6 months old, twins Ani and Riri couldn't be more different. Loud and adventurous Ani wants to be a sleuth when she grows up. Shy and quiet Riri prefers books to people, and just wants a safe, germ-free job when she grows up.When they're forced to spend the summer together, Ani is convinced it's going to be another Great Twin War like the last time they tried family bonding. But this summer is different - there's a murder, and their dad is arrested as the prime suspect. Can they work together to protect their family and solve the mystery?