The story of Gisele Pelicot shocked the world. For almost a decade, the 72-year-old French grandmother’s husband Dominique secretly sedated her with sleeping pills and anxiety medication and raped her. He invited fifty other men to rape her too - documenting the abuse in thousands of photographs and videos. Dominique Pelicot has been jailed for 20 years. But Gisele is not alone.

One British woman, Kate (not her real name) has told File on 4 Investigates how she confronted the unthinkable – that the man she thought loved her, had been secretly drugging and sexually assaulting her for years. He laced her bedtime cup of tea with medication so he could commit his crimes in secret.

File on 4 investigates hears from the police detective who built the case against Kate’s now ex-husband, and how he almost avoided being brought to justice after the Crown Prosecution Service initially said there wasn’t enough evidence to put him on trial. It was left to Kate to fight the system to get justice – and keep herself safe.

File on 4 Investgates discovers domestic spiking is disturbingly common in cases of domestic abuse. One academic has coined the term ‘chemical control ’ to describe the administration of medication to physically subdue women. Unlike physical violence, spiking may leave no trace and hence go unnoticed by victims, the police, doctors, and social workers.

A new named offence of spiking is soon to be introduced. But with much of the focus still on spiking in settings like bars and clubs, will it address the threat behind closed doors?

Reporter: Jane Deith

If you've been a victim of sexual abuse or violence, details of help and support are available at bbc.co.uk/actionline