Mystery Ranch, A Graphic Novel #4 (Boxcar Children Graphic Novels)

Henry, Jessie, Violet, and Benny Alden have just found out they have an Aunt Jane who hasn't spoken to their grandfather in years. The children are spending the summer on Aunt Jane's ranch out west. On the way there, the girls spy a "mystery man." Will he reveal an amazing discovery about the ranch that will change everything?