Tangled Roots

Oh what a tangled web we weave, when first we practise to deceive.Following news of the death of his Aunt, Brad Johnson, an American, travels to Manchester England, researching his ancestral roots. Whilst visiting an Art Gallery he suffers a heart attack. Forensic tests are not conclusive with natural causes. Brad receives death threats. Chief Inspector Bill Lambert suspects foul play. Finding no firm evidence a crime has been committed he consults the Gent to investigate the complex labyrinth of Brad's family history.What does this have to do with the murders of prostitutes in Chorlton Street Coach Station?