The intrusion

Summary: "Arin Welsh grew up in the foster care system. She and her husband Jake spent years entangled in a cult before breaking free. When they decided to start a family, they were thwarted by infertility. Finally, Arin has found stability. Through in vitro fertilization, she gave birth to Troy. Her warm marriage, professional fulfillment as a sign language interpreter, and the affection and support of an unlikely friend provide the backdrop for a tranquil life. Then one chilling day, four-year-old Troy is maliciously altered by forces that Arin and Jake are unable to comprehend. Can Arin contend with the mayhem surrounding her? Or will she dare to consider a source of protection and redemption greater than herself?"--Publisher's description.