Wyatt is taken for treason but his head injury means loss of memory as well as loss of freedom.
He begins life anew as a THIRD CLASS CONVICT on the Woolwich hulks.

Amy cannot leave him to rot on the prison ship, but she is unaware that others plan to cut his sentence short permanently. A foiled Irish secaper, and a killer sent to protect police informer Conrad Sperling's identity, make Wyatt's hard new life even harder.

And then there is the cholera.