As her senior capstone project, Pippa Fitz-Amobi is determined to find the real killer in a closed, local murder case, but not everyone wants her meddling in the past.

"Seventeen-year-old Cassie, who has a natural ability to read people, joins an elite group of criminal profilers at the FBI in order to help solve cold cases"--

Twelve-year-old Alex Sherlock, his thirteen-year-old sister Zoe, and their friends Lina and Yadi decide to spend their summer in Miami investigating the many "cold cases" their grandfather accumulated during his years as a reporter -- first up, Al Capone and a buried treasure.

The chalks are drawing flowers on the chalkboard, but someone keeps stealing their artwork. Sergeant Blue is on the case and determined to solve the mystery. Who could the thief be?--

Living in the luxurious Arcanum building, with its interior balconies perfect for playing tag, an elevator like an iron birdcage, and quirky neighbors behind every apartment door, has always been fun and games for twelve-year-old Minerva Keen until her neighbors start getting poisoned. Anyone could be next, and everyone is a suspect, including Minerva herself. To clear her name and help the police crack the case, Minerva starts her own detective club....

Atticus "Atty" Peale fights for the rights of animals, copes with having a racially-mixed family in small-town Alabama, navigates the social scene of middle school, and determines to help her father prove Jethro Gersham innocent of murder.

Sixteen-year-old Maddie Flynn cannot help but see the death date of everyone she meets or sees in a photograph or on-screen, and her alcoholic mother exploits this by having her do readings for money, but when Maddie predicts the death of a young boy, she becomes the center of an FBI investigation.

While helping the Portland County Sheriff's Search and Rescue to seek a missing autistic man, teens Alexis, Nick, and Ruby find, instead, a body and join forces to find the girl's murderer, forming an unlikely friendship, as well.