Dark web investigator uses brick pattern to locate and rescue abused child

BBCSquire and his team monitor dark web chatrooms around the clock to watch for any clues that could identify and locate abused children

John Harp was able to identify the type of brick in the wall shown behind Lucy Squire at his home in New Hampshire - he found it very disturbing that Lucy was a similar age to his own daughter

Squire has struggled with his mental health as a result of his work

"I feel honoured to be part of the team that can make a difference," says Squire

Lucy (left), now an adult, told Squire she had been praying help would come