Two Twisted Crowns by Rachel Gillig

Two Twisted Crowns largely focused on Elm and Ravyn, with Elm's story being intertwined with Ione's. The plot was split between the two, with Ravyn going into the forest to track down the elusive Twin Alders card in order to save his brother and bring back Elspeth In perfect condition. Bundle with “One Dark Window”, the first book in the series to save!