Book excerpt: Detective Sergeant Harry Keeble's bestselling books, Baby X and Little Victim described his early years in Hackney's Child Protection Unit, as he battled to get to grips with cases of unimaginably horrific child abuse. In Broken Angels, a more experienced Harry relates a series of extraordinary cases he encountered with Ella, a young and newly qualified social worker. Together, Harry and Ella faced the violence of forced marriage, the horror of maternal incest and the cruelty of child slavery. Their investigations took them into a mosque, a drug den and a recording studio. Just as the unrelenting caseload threatened to push the inexperienced Ella over the edge, Harry uncovered one of the most shocking cases of child abuse he'd ever encountered, forcing the duo to tread new ground in the search for justice. Broken Angels reveals why working in Child Protection has never been so tough. It also shows why, despite the fact that so many courageous people are ready and willing to meet impossible challenges, we are still unable to reach all of the broken angels that so desperately need our help.