GRENOBLE, France—It started with the disappearance of 8-year-old Maëlys de Araujo at a wedding in the French Alps. After a massive search that drew nationwide attention, investigators identified a wedding guest as the main suspect. But that was just the beginning: The investigation led authorities to suspect the man in other crimes around France.
Dog trainer Nordahl Lelandais goes on trial Monday in Grenoble accused of kidnapping and killing Maëlys. He faces up to life in prison if convicted.