The Sultan of the Sulu Sea
by Duncan Watt
This is the eighteenth book in the Wallace Boys series. 'The Sultan of the Sulu Sea' follows on from 'The Treasure of the Tiger'. The boys’ return to Singapore is forestalled by the appearance of the pirate boat, the Sabil. Following a desperate attempt to elude the Moro pirates, the Silver Spray is captured and the boys are taken as hostages!