The Case of the Secret Signal by Dermot Flynn

Ireland, 1911A secret signal flashes in the night .It's an SOS. Is someone being held prisoner?Friends Tim, Deirdre and Joe set out to investigate. What starts as a diversion while on holiday in Carlingford quickly spirals into a dangerous adventure. Can they solve the case before it's too late? And who can they trust?
Binding: Paperback / softback