Ghost Story (1) - S1.E1

Jamal sees some strange masked creatures in the park and finds a THABTO button where the masked creatures were. Also, Jamal's sister, Danitra, goes to college and leaves him her computer. On the first day he gets a weird message asking ""Where are the children, are they OK?"". Lenni Frazier, a school mate of Jamal's, is also contacted by the strange ghost-like creature. Who is this mysterious being? Meanwhile, elementary student Gaby Fernandez gets her backpack stolen on her way to school.