The Only Witness - M K Farrar

When a body is discovered buried in wasteland in East London, it’s clear from the level of decomposition that it’s been there a long time.
DI Erica Swift is brought in on the case to discover who put the victim in the ground.
What secrets can the body reveal?
As the evidence is gradually revealed, those who know the truth find their lives in danger.
Will someone kill again to keep the secret of the only witness?