Having returned from a voyage to Bristol, Thomas Locke receives terrible news: his best friend Benson has died at the hands of certain “skull hunters”. However, the messenger who brought this sad news asks Thomas not to try to find the killers in order to avenge his friend - when the help of Locke and his people is needed, the envoy of the mysterious Gray Brothers will find him. The novel “The Gray Brothers” is the fourth book in the series already loved by Russian readers books by the popular writer Vladimir Kovalevsky (Tom Sherwood) about the life and extraordinary adventures of master Thomas Locke Leigh, a carpenter and sailor from Bristol, and his friends.