British actor Jamie Thomas King is adapting James Titcombe’s memoir Joshua’s Story: Uncovering the Morecambe Bay Maternity Scandal for the big screen.

King, best known for star turns in Mad Men and The Tudors, is penning a screenplay for Trust, a movie to be produced along with wife and Canadian actress Tamara Podemski as part of their newly-launched Blackbird Productions banner.

“Right now, I do not have intention to act in or direct the project. But yes, I became interested in the subject following Benjamin’s death and subsequent lawsuit,” King told The Hollywood Reporter on Thursday.

In 2016, the preventable death of their second son, Benjamin, due to medical negligence occurred five days after Podemski gave birth after a delayed caesarean section. The star of Reservation Dogs and Outer Range at the time had been 14 days overdue and was rushed to the Royal United Hospital in Bath, Somerset,...