1st case
(Book)

"Recruited into the FBI when her unorthodox programming skills get her kicked out of MIT, a computer genius tracks a killer who has been targeting young women through a sophisticated messaging app."--,Provided by publisher.

Angela Hoot's unorthodox programming skills get her kicked out of MIT's graduate school -- and into the FBI's cyber-forensics unit as an intern. There's a messaging app with sophisticated tracking capabilities surfaces. Its beta users, all young women, are only identified as they turn up dead in their bedrooms. As Angela races to crack the killer's digital code, their technical rivalry escalates. She must deny the killer access to her personal life, or risk losing her life to the underbelly of the Internet. -- adapted from Amazon info