Steven Soderbergh's top secret directorial project Logan Lucky is building up its cast as the hot package is shopped in Cannes.

Riley Keough, who stars in the TV series The Girlfriend Experience (which is executive produced by Soderbergh), has joined the cast.

Soderbergh, who hasn't helmed a movie since 2013's medical thriller Side Effects, is returning to directing with Logan Lucky, which has been shrouded in secrecy since it first broke ahead of the Berlin Film Festival in February. The director has never officially confirmed he'll be breaking out of his self-declared retirement, but Filmnation is selling international rights in Cannes.

Channing Tatum and Michael Shannon will star in the project, playing brothers who plan a heist during a high-profile NASCAR race. Gregory Jacobs, Mark Johnson and Reid Carolin are producing.