This one is an old Puritan book and the kindle version is free. "The Crook in the Lot" is about trials, https://www.amazon.com/gp/product/B07C4M23MY

Transforming Prayer, https://www.amazon.com/gp/product/0764208519

Breakthrough Prayer, https://www.amazon.com/gp/product/B005GNL8DY

The Darkness and the Glory, https://www.amazon.com/Darkness-Glory-His-Gethsemane-Ascension/dp/193495201X

The Cup and the Glory, https://www.amazon.com/Cup-Glory-HARRIS-GREG/dp/0977226212

Seeking Allah, Finding Jesus, https://www.amazon.com/Seeking-Allah-Finding-Jesus-Christianity-ebook/dp/B07BB54FS5

Saving my Assassin, https://www.amazon.com/Saving-My-Assassin-audiobook/dp/B073ZKNM5C

Study the Bible (40 methods), https://www.amazon.com/Learn-Study-Bible-Andy-Deane/dp/1607915766