The International Committee of the Red Cross calls it “a major problem”, while the United Nations says it has no idea of the numbers involved. The one thing that is certain is that at least hundreds of families in Gaza are still looking for relatives who have disappeared without trace following the 50-day Israeli offensive that began in July. For some, the answer may lie beneath the rubble of destroyed buildings that still litter the land. But there is also speculation that other missing Palestinians may be detained in Israel, or have met death as they fled by sea to Europe. Mediapart’s Middle East and North Africa affairs correspondent Pierre Puchot reports from Gaza on an enduring mystery that has become something of a taboo.