The Snare by Rafael Sabatini, Fiction, Action & Adventure

Secrecy and unity are crucial as traitors infiltrate high ranks, undermining efforts against the enemy. A young British officer's blunder exposes a plot that threatens to unravel everything. The Portuguese Council of Regency seeks a scapegoat, placing the officer's fate in the hands of his brother-in-law, Sir Terrence Amoy, who serves as the British adjutant-general in Lisbon. Tensions rise as loyalty and betrayal intertwine, leading to a gripping confrontation between familial ties and duty.