Episode one of fourth series of the BBC documentary about the Met showcased how detectives worked tirelessly to ensure they got justice for murdered teenager, Levi Ernest Morrison and his family.

We spoke with Levi's mum comprehends how a mother could do such a thing and orchestrate such an attack.

In April 2021, Levi was chased by four masked thugs and fatally stabbed, yards from his home. Thanks to the determination from the investigating team, a mother and her son and three other boys were jailed for the brutal attack which lasted 30 seconds.

In this video, we hear how Levi's mum comprehends how a mother could do such a thing and orchestrate such an attack.

Hear more from Levi's family on their son who they miss deeply and how knife crime can happen to anyone.