The Hallmarked Man

A dismembered corpse is discovered in the vault of a silver shop. The police initially believe it to be that of a convicted armed robber - but not everyone agrees with that theory. One of them is Decima Mullins, who calls on the help of private detective Cormoran Strike as she's certain the body in the silver vault was that of her boyfriend - the father of her newborn baby - who suddenly and mysteriously disappeared.