This excerpt, taken from the Doctor Who: The Tenth Doctor and River Song box set, is available free to Big Finish Newsletter subscribers in November 2020.
Precious Annihilation by Lizzie Hopley
When jewels become lethal in the London of 1912, both River and the Doctor turn up to find out why.
A mystery takes them centuries into the past, and onto the high seas, where a superstitious crew edges towards mutiny.
The star-crossed couple are about to find out that, while gemstones inspire jealousy, love can be the deadliest treasure of all...