Rod Galindo: 2 books

Young Max hates Fourth Grade math. His teenage friend Claire is an ace with numbers, and is always eager to help him with his homework. Max adores her, and loves when she visits him in the old house on Hollow Street.Claire can also weave a ghost story like no one else. But her favorite tale always sends chills down his spine, and hits a little too close to home...

Jonas held his breath as the murderous machine turned toward him.  Had he been seen?  No.  Not yet.  Could he make it out of the submarine's hangar and to a life boat?  These C.L.O.W.N. bots were fast, but his bionic parts would give him an edge.  Or would they?  This bot was different; its organic...