Thousands of young Russian Muslim men were lured to join so-called Islamic State - taking their wives and children with them. But since the "caliphate" fell last year, those families have vanished - and grandmothers back in Russia are desperate for news. The Kremlin wants to bring the children home. It says they've committed no crimes. But finding them and their mothers is hugely difficult. Iraqi authorities say they're holding many IS families - but they won't name them. Gradually though, dramatic scraps of information are emerging - a scribbled note from a prison, whispered phone messages, photos and videos on social media. For months, Tim Whewell has been talking to the grandmothers as they've gathered such clues - and now he travels to Iraq in search of more information, tracing the route the fighters and their families took when they were defeated - and trying to solve the mystery of what happened to them. What was the fate of the men after they surrendered at a remote village school? And what of the reports that many of the women and children were subsequently abducted by a militia? As the story unfolds, Tim confronts a powerful Shia warlord. Will the jihadis' children be released? What kind of justice will their mothers face? And what will the grandmothers - convinced of their daughters' innocence - do to try to get them back?
Presenter Tim Whewell
Producers Nick Sturdee & Mike Gallagher.
The Child Saver of Mosul
A one-woman whirlwind of passion and energy, Sukayna Muhammad Younes is a unique phenomenon in Iraq. A council official in the half-destroyed city of Mosul, former stronghold of so-called Islamic State, she's on a mission to find and identify the thousands of children who went missing during the conflict - and reunite them with their families. It's a massive task - and deeply controversial because Sukayna makes no distinction between children who are victims of IS - and those who belonged to IS families. "They're all just children - all innocent," she says. Tim Whewell follows Sukayna through the rubble of the city, visiting her orphanage, trying to find missing parents, meeting families who want to reclaim children. Can she solve the mystery of Jannat - an abandoned fair-haired girl who may be the daughter of a foreign IS family? Can she help Amal, sister of a dead IS fighter, to adopt her baby niece? How can families afford the expensive DNA tests the authorities require before families can be reunited? As she tries to solve these problems Sukayna also has to look after her own family of six children - and cope with personal tragedy. Two of her brothers were killed by jihadis; her family home, used as an IS base, is now in ruins. Highly charismatic - Sukayna now wants to go into politics. "I am a mini-Iraq," she says - her family includes members of many communities - and she believes the country desperately needs more dynamic, tolerant people like her, to bring real change and overcome divisions. But it's hard to be a high-profile, energetic woman in patriarchal Iraq - and she's faced death threats both from remaining IS supporters - and those who think she's too ready to help "terrorist" families.
Presenter Tim Whewell
Producers Nick Sturdee & Mike Gallagher.
Greece's Haven Hotel
In a rundown neighbourhood in Athens there is a hotel with 4,000 people on its waiting list for rooms. But the roof leaks and the lifts are permanently out of action. None of the guests pay a penny, but everyone's supposed to help with the cooking and cleaning.
City Plaza is a seven-storey super squat housing 400 refugees from 16 different countries and the volunteers who support them.
The hotel went bankrupt during the financial crisis. It remained locked and empty until 2015, when Europe closed its borders leaving tens of thousands of refugees trapped in Greece. Then a group of activists broke in, reconnected the electricity and water and invited hundreds of migrants from the streets to take up residence with them.
The leftist Greek government has so far turned a blind eye and now mainstream NGOs like MSF and even the UNHCR have started co-operating in this illegal project. For Crossing Continents, Maria Margaronis finds out how the hotel operates and get to know the people inside.
Producer: Chloe Hadjimatheou.
Digging Up the Past in Catalonia
Why is troubled Catalonia now opening up civil war mass graves?
Spain has the second largest amount of mass graves in the world after Cambodia. Over 100,000 people disappeared during the 1930s civil war and the ensuing Franco dictatorship. Decades later, the vast majority are still unaccounted for.
Forgetting Spain's painful past and the disappeared is what allowed democracy and peace to flourish, the argument has long gone.
But many have not forgotten - including in the region of Catalonia, where bitter memories of Franco's rule are just beneath the surface. Before Madrid imposed direct rule last October, the pro-independence Catalan government began an unprecedented plan to excavate civil war mass graves and collect DNA from families looking for their lost relatives.
Estelle Doyle travels to the politically troubled region and finds out how, despite direct rule, those seeking answers are more determined than ever to recover the past and to confront Spain's painful history. Others worry that their actions will only but reopen old wounds and further divide the country.
Presenter: Estelle Doyle
Producer: John Murphy.
**This podcast has been changed: Correction: El Soleras is in the West of Catalonia, while Catalonia itself is in the North East of Spain**
Sweden's Child Migrant Mystery
For nearly two decades, Swedish health professionals have been treating asylum-seeking children who fall into a deeply listless state. They withdraw from the world, refuse to speak, walk and eat - most end up being tube-fed. They are known as, "the apathetic children" in Sweden. More recently this illness has been termed Resignation Syndrome. Experts agree it is children who have experienced deep trauma who are vulnerable. Doctors link the condition to an uncertain migration status. But why, asks Linda Pressly, does it only seem to happen to children in Sweden, and how can they recover?