Casualties of War

S5 E2: Foyle's life is turned upside down when his goddaughter Lydia, and her traumatised seven-year-old son James, turn up on his doorstep needing somewhere to stay. However, soon after their arrival, Lydia disappears and Foyle finds he must care for Lydia's troubled young son until he can find Lydia and bring her home. To add to the pressure, a series of sabotage cases keeps Foyle occupied.